Copyright 1983 by the American Psychological Association, Inc. Psychological Bulletin 1983, Vol. 94, No. 2, 239-264 The Schachter Theory of Emotion: Two Decades Later Rainer Reisenzein Free University Berlin, Federal Republic of Germany Schachter's cognition-arousal theory of emotion is critically examined from both a conceptual and an empirical point of view. Several of the theory's less clearly defined aspects are clarified, and empirical evidence pertaining to three major deductions from the theory is reviewed. It is concluded that only one of these deductions, claiming that misattributed arousal from an extraneous source intensifies emotional reactions, can be considered adequately supported by the data. Little support is found for the second hypothesis, that arousal reduction leads to a reduction in the intensity of emotional state, and the status of the third hypothesis, that misattribution of emotionally induced arousal to a neutral source results in a reduction of emotionality, is considered equivocal because of plausible alternative interpretations of the pertinentfindings.Furthermore, it is concluded that there is no convincing evidence for Schachter's claim that arousal is a necessary condition for an emotional state, nor for the suggestion that emotional states may result from a labeling of unexplained arousal. It is suggested that the role of arousal in emotion has been overstated and that the available data support at best a rather attenuated version of Schachter's theory—that is, that arousal feedback can have an intensifying effect on emotional states—and that this arousal-emotion relationship is mediated, in part, by causal attributions regarding the source of arousal. Two decades have passed since Schachter and Singer (1962) published the classic Psychological Review article in which they first proposed what came to be known as the "cognition-arousal" theory of emotion. This formulation, alternatively labeled the "cognitivephysiological," "two-factor," "jukebox" (Mandler, 1962), or simply the Schachter theory of emotional states, has since become the most influential cognitive approach to emotions. Moreover, the theory has been influential in areas of research other than emotion, such as eating and obesity (Rodin, 1981; Schachter, 1967, 1971), psychopathy (Schachter & Latane, 1964), drugs (Nesbitt, 1974; Pliner & Cappell, 1974; Rossi, Kuehnle, & Mendelson, 1978), dissonance (e.g., Cooper, Zanna, & Taves, 1978; Higgins, Rhodewalt, & Zanna, This article was written while the author was a visiting Fulbright Scholar at the University of California, Los Angeles. I would like to thank Bernard Weiner, Shelley Taylor, Sandra Graham and Ellen Skinner, as well as two anonymous reviewers, for their helpful comments on earlier drafts of the manuscript. Requests for reprints should be sent to Rainer Reisenzein, Free University Berlin, 1000 Berlin 19, Ulmenallee 32, Federal Republic of Germany. 1979; Zanna & Cooper, 1976), attitude change (Cantor, Mody, & Zillmann, 1974; Mintz & Mills, 1971), and other diverse areas (e.g., London & Monello, 1974; Maher, 1974; O'Neal, 1971). The theory, however, has not remained without critics, and especially in recent years increasing doubts have been raised as to the adequacy of Schachter's formulation (e.g., Leventhal, 1980; Marshall &Zimbardo, 1979; Maslach, 1979). The present article attempts to critically assess the current status of Schachter's theory. The review is organized into three parts. First, the theory is examined from a conceptual point of view, with an emphasis on the clarification of its less clearly defined aspects; second, empirical evidence pertaining to three major deductions from the theory is reviewed;1 and third, the em1 Several partial reviews of Schachter's theory have been published in recent years (Dienstbier, 1979a; Leventhal, 1979, 1980; Zillmann, 1978). However, in none of these articles has the major emphasis been on a review of Schachter's theory, none of them are complete, and the conclusions of these authors differ at times from those reached in the present paper. It should also be noted that this review does not in- 239 240 RAINER REISENZEIN pirical status of the theory is evaluated in the light of those data, ending with a discussion of several implications for theory and research on emotion. Schachter's Theory From a Conceptual Viewpoint Two different versions of the Schachter theory can be distinguished: (a) the theory as originally formulated by Schachter and Singer (1962) and subsequently elaborated by Schachter (1964; see also Schachter, 1971) and (b) the attributional formulation of the theory (e.g., London & Nisbett, 1974; Ross, Rodin, & Zimbardo, 1969; see also Dienstbier, 1979b; Kelley, 1967). Both versions will be discussed in this section, with more emphasis on the attributional formulation because it constitutes the more widely accepted view. The Theory The set of propositions that makes up Schachter's theory of emotion can be broken down into two distinct subsets. The first of these subsets concerns the components or elements of an emotional state; the second subset concerns processes of emotion generation. Components of an emotional state. According to Schachter, an emotional state is the result of the interaction between two components: physiological arousal and a cognition about the arousing situation. Physiological arousal, which is conceptualized as being diffuse (i.e., emotionally nonspecific) in nature, determines the intensity, but not the quality, of an emotional state. The cognition determines which emotion, if any, will be experienced. Both cognition and arousal are considered necessary conditions for the occurrence of an emotional state (this is implied in Schachter's, 1964, statement that they are related "mulclude the work on false physiological feedback, originated by Valins (1966), which rests on the fundamentally different assumption that the belief of being aroused by or having reacted to emotional stimuli is sufficient for an emotional state. A comprehensive review of this area of investigation has recently been provided by Liebhart (1980). tiplicatively"); if either of them is missing, no emotion will be experienced. The mere presence (i.e., temporal coincidence) of these two components is, however, clearly not sufficient for an emotion (see Gordon, 1978; Leventhal, 1980). For example, to experience fear it is not sufficient to be aroused at the same time that one perceives oneself to be in danger. Even with both the cognition of perceived threat and arousal present one will not experience fear unless one "connects up" (Gordon, 1978) the cognition with the felt arousal; or, as Schachter expresses it, unless one "labels" one's arousal in terms of the "emotional" cognitions. Labeling of arousal has subsequently been interpreted by attribution theorists (e.g., London & Nisbett, 1974; Ross et al., 1969) as causal attribution of arousal. In terms of this attributional analysis, then, an individual will come to experience an emotional state if, and only if, (a) arousal is present; (b) an appropriate (i.e., emotional) cognition is present; and (c) there is a perceived causal connection between ''these two elements (in other words, the individual attributes his or her arousal to the emotional source; see Ross et al., 1969). Thus, although Schachter does not make this explicit, an emotion is actually a result of arousal and two cognitions: one that characterizes the situation in an emotional way (e.g., the belief of being endangered), and a second (a causal belief) that connects the emotional cognition (the cause) with the arousal (the effect; Gordon, 1978). It should be noted that the reinterpretation of Schachter's labeling as causal attribution is not completely unproblematic, because labeling appears to have a broader meaning than causal attribution of arousal and, although it includes the latter, it is not necessarily restricted to it (see also, Berkowitz, Lepinski, & Angulo, 1969). For example, labeling can also mean the evaluation of the appropriateness of one's feelings by comparing oneself with others (Schachter, 1971)—that is, the adoption of norms of appropriate emotional conduct in a situation. In fact, it has been argued (e.g., Maslach, 1979; Zimbardo, Ebbesen, & Maslach, 1977) that what was provided by the situational context in Schachter and Singer's (1962) basic study were at best such normative standards, rather than causal explanations of arousal. However, the exact meaning of "la- THE SCHACHTER THEORY OF EMOTION beling" is hard to determine even with a close reading of Schachter's writings. The attributional interpretation has the considerable advantage of rendering this rather vague construct precise. Therefore, in the rest of this article I will adhere to the attributional interpretation of Schachter's theory, which equates labeling with causal attribution. Because of this, Schachter's studies (e.g., Schachter & Singer, 1962) will be discussed as "misattribution" studies, with the understanding that this need not be exactly what Schachter had in mind. Processes of emotion generation. Schachter specifies two different ways an emotion can be generated, one being the usual, everyday one, the second being more atypical and perhaps mainly of experimental interest (cf. Mandler,1975). In both cases, the processes involved include emotional appraisal of the situation, perception of arousal, and attribution of arousal; however, the temporal sequence of these processes differs. In everyday emotional states, the cues that arouse the organism also normally provide (in the course of being appraised in an emotional way) the cognitive labels for arousal (see Figure 1). As Nisbett and Schachter (1966) state: "In nature, of course, cognitive or situational factors trigger physiological processes, and the triggering stimulus usually imposes the label we attach to our feelings" (p. 228). It also seems reasonable to assume that the cognitive processes involved occur quite rapidly and are largely unconscious in nature (see Rule, Ferguson, & Nesdale, 1979; Taylor & Fiske, 1978); the individual is aware only of the resultant emotional state. If one is willing to make this assumption, then criticisms of Schachter's theory (e.g., Lang, 241 1971) which maintain that the cognitive processes in question are too slow to account for everyday emotional experience seem to be largely unfounded. The second way that an emotional state can arise (see Figure 2) starts with the perception of "unexplained" arousal, that is, arousal for which no immediate causal explanation is available or that is too intense to be sufficiently explainable by the potentially arousal-producing cues salient to the individual. This might be the case, for example, in physiological disorders, consumption of drugs with unknown side effects, beginning illness, sleep deprivation, hormonalfluctuations,and so forth (Dienstbier, 1979b). More importantly, however, it is possible to create such a state experimentally, as Schachter and Singer (1962), and Schachter and Wheeler (1962) attempted to do in the experiments that were designed as the original tests of the theory. For the case of unexplained arousal, Schachter proposed that this state would lead to the "arousal of 'evaluative needs'. . . that is, pressures would act on an individual in such a state to understand and label his bodily feelings" (Schachter & Singer, 1962, p. 381). In the attributional reformulation of the Schachter theory, the motivational construct ("evaluative needs") was abandoned, and it was postulated that individuals experiencing unexplained arousal would initiate an epistemic search process directed at locating a cause for the arousal. More specifically, in the case where no causal explanation of sufficient likelihood is immediately available to account for the arousal, automatic (schematic) processing is disrupted, and a more deliberate, and possibly (though not necessarily) conscious attributional search process is set Figure 1. The process of emotion generation in everyday life. 242 RAINER REISENZEIN Figure 2. The process of emotion generation in the case of unexplained arousal. into motion (see Rule et al., 1979). This attributional search process is terminated as soon as a plausible cause for the arousal is found; if this cause is of an emotional nature, a corresponding emotion will result. It appears that "finding a cause" for arousal could occur in at least two different ways: (a) by detecting a cause that was previously unattended to or overlooked by the individual and/or (b) by reappraising possible emotional sources (e.g., by reinterpreting an event as more threatening, funny, etc.). How this latter process could operate is not entirely clear, although it has been argued that it might include anything from mere passive inference (Bern, 1972) to active self-persuasion and hypothesis-testing (Liebhart, 1980; Nisbett & Valins, 1972). In the extreme case, even an event that normally would not have been capable of eliciting an emotion could this way come to be appraised emotionally. It should be reiterated that Schachter did not intend this second way of emotion generation to be understood as a model for the arousal of emotions in everyday life, although many authors apparently have interpreted Schachter this way. However, as London and Nisbett (1974) make clear, "In nature . . .an emotion may result immediately without any 'evaluative needs' having arisen or a 'process of explanation' having been initiated" (p. 14; see also Mandler, 1975). Nonetheless, heavy emphasis has been put on this special case, perhaps partially because of the fascination of the associated experimental paradigm (Schachter & Singer, 1962) and the predilection for "nonobvious predictions" that was so characteristic of social psychology of the 1950s and 1960s (Bem, 1972). However, the fact that this case of emotion generation was not meant to be characteristic of the way emotions arise normally suggests that this emphasis might have been misplaced. Clarification of Concepts: Emotion, Cognition, Arousal Precise meaning of concepts is one of the key requirements of a testable empirical theory (Bunge, 1967). Applying this criterion to Schachter's theory, it is difficult to deny that the basic constructs of the theory—emotion, cognition, and arousal—are among the least precisely defined of psychological concepts. Nor did Schachter always make fully explicit the intended meaning of these constructs in the context of his theory. As a consequence, discussions of the theory have frequently been plagued by lack of clarity and consensus about the meaning of these central terms. Therefore, an effort will be made to clarify what their meaning is in the context of Schachter's theory. Emotion. Since James's (1884) time, psychologists have repeatedly pointed out the confusion about the meaning of the concept emotion (e.g., Leeper, 1965; Leventhal, 1974; Mandler, 1975; Strongman, 1973). However, although there is no generally accepted definition of emotion, it is now usually agreed that at least the following four components should be taken into account (e.g., Dienstbier, 1979b): emotional experience (subjective feelings), physiological arousal, expressive reactions, and emotion-related instrumental activities. Extending this viewpoint, some theorists have suggested that on a very general level, emotions can be best understood as multidimensional response syndromes (e.g., Averill, 1968, 1980; Lazarus, 1968; Lazarus, Averill, & Opton, 1970; Spiro, 1979; see also, THE SCHACHTER THEORY OF EMOTION Hugdahl, 1981). This conception of emotion also is certainly in accord with Schachter's use of the construct. However, two important specifications have to be made. First, Schachter's theory refers primarily to the subjective component, that is, to the conscious experience of feeling states (operationalized most directly by reports about inner experience). Thus, it is aptly termed a "theory of subjective feeling" (Leventhal, 1974; see also Gordon, 1978). In the first of his research reports (Schachter & Latane, 1964; Schachter & Singer, 1962; Schachter & Wheeler, 1962), Schachter is somewhat ambiguous on this point, treating expressive reactions, emotion-related instrumental activities, and reports about subjective feelings (as well as stimulus evaluations) as more or less equivalent and interchangeable indicators of an underlying emotion. In his summary statements, however, Schachter is more explicit (Schachter, 1964, 1971). Specifically, when discussing Cannon's (1927; see also Fehr & Stern, 1970) argument that sympathectomized animals continue to display emotional behavior, Schachter argues that physiological arousal is necessary for the experience of an emotion (feeling), but not for emotion-related behavior (see also Hohmann, 1966). Second, although Schachter specified the relations between the arousal and the subjective (feeling) component of emotions, he left the relations between subjective feelings and both expressive and instrumental emotion-related behaviors unspecified. In particular, he did not maintain that a subjective feeling state motivates or causes corresponding overt behavior, as claimed by some authors (e.g., Berkowitz & Turner, 1974; Koenig & Henriksen, 1974). As London and Nisbett (1974) state: "In certain of his studies of emotion, Schachter has measured behavior (as distinguished from a self-report of emotional state) but Schachter has conceived of that measurement, not precisely as a measure of behavior which the emotion causes . . . but simply as a measure of the emotional state itself" (p. 22). From this one can conclude that in empirical tests of Schachter's theory, measures that tap subjective experience must be considered to be of prime importance, whereas no definite predictions can be made for emotion-related behaviors without the help of some additional 243 assumptions concerning the feeling-behavior relationship (see also Bern, 1972). In fact, such assumptions are at least implicitly present in many of the studies that include behavioral measures (e.g., Schachter & Latane, 1964; Nisbett & Schachter, 1966; Storms & Nisbett, 1970). Cognition. Although Schachter does not clarify the meaning of "cognition" ("emotion is a function of cognition and arousal") in great detail, it becomes evident from the examples he refers to, as well as from the studies he quotes in this context (specifically, Hunt, Cole, & Reis, 1958), that what is meant by cognition is a particular subjective interpretation of a situation or an event, such as interpreting a situation or an event as being "dangerous," "hopeless," "funny," or "sexually exciting." These cognitions may be regarded as constituting part of the subjective meaning that we constantly attach to our environment (Mandler, 1975). By referring to these cognitive interpretations, rather than to the eliciting objective stimulus events per se, Schachter demonstrates his commitment to the fundamental cognitive postulate that it is the subjective representation of the environment that arouses emotions, motives, and behaviors (Baldwin, 1969). However, neither the specific types of cognitions that underlie specific emotional states nor the processes of interpretation that give rise to these states are clarified by Schachter in any detail. His position nevertheless seems compatible with the views of other theorists who have addressed these problems. Specifically, a number of theorists have tried to identify the types of cognitions that might underlie specific, subjectively distinguishable feeling states (e.g., Beck, 1974; Hunt et al., 1958; Kemper, 1978; B. Weiner, 1982; Roseman, Note 1). One can tentatively conclude from this work that the cognitions involved include evaluations, values, expectancies, and causal beliefs about the events that are appraised. As to the processes of interpretation that give rise to these emotionally relevant cognitions, several theorists have postulated some sort of unique appraisal process to be crucially involved (e.g., Arnold, 1970; Lazarus, 1968; Mandler, 1975). It is, however, usually emphasized that this process is an integral part of the broader cognitive analysis of our environment that 244 RAINER REISENZEIN constantly takes place (Mandler, 1975). Schachter would probably also agree with the view espoused by some (e.g., Arnold, 1970; Mandler, 1975) that the appraisal process is usually rapid and unconscious, thus explaining why our emotional reactions to even highly complex situations are often quite rapid. Emotion, then, according to Schachter, and in contrast to other views (e.g., Zajonc, 1980), is a postcognitive phenomenon. Arousal. Although Schachter maintains that "the present formulation . . . [applies] to any of a variety of states of physiological arousal (1971, p. 47), it becomes clear upon closer examination that, as used by Schachter, the term arousal refers primarily to heightened activity of the peripheral vegetative system (ANS; see Fehr & Stern, 1970; Lader & Tyrer, 1975): "emotional states m a y . . . be generally ' characterized by a high level of sympathetic activation" (Schachter, 1971, p. 47). As mentioned above, this peripheral arousal is conceived as being essentially undifferentiated (i.e., emotionally nonspecific) in nature; or more exactly, although Schachter does not deny the possibility of emotion-specific physiological patterns, he believes that physiological differences between emotions, if they exist, are too subtle to be of psychological significance (Schachter & Singer, 1962, p. 380). Furthermore, arousal per se is conceived of as affectively neutral (see also Schachter & Singer, 1979). In addition, an important distinction must be made between peripheral physiological arousal per se and perceived arousal, that is, the perception of feedback from the periphery (see Brener, 1977; Shields & Stern, 1979). Again, Schachter is not quite explicit on this point, but it seems that, as far as the physiological component is concerned, perceived arousal rather than arousal per se is the proximate determinant of an emotion; in other words, arousal and its feedback becomes "psychologically significant" (Mandler, 1975) only to the degree that it is perceived by the individual. This is definitely the case for unexplained arousal (Schachter & Singer, 1962, p. 381). It also appears to be a necessary assumption for the more usual, everyday process of emotion generation: How does arousal enter cognitive processing (i.e., attribution) if it is not cognitively represented in some form? However, in contrast to the position taken by Valins (1966), this perception process has to occur via introception (see Brener, 1977). Schachter's emphasis on the perceptual experience of arousal, rather than arousal per se, has several important consequences. First, it provides an additional mechanism to account for the proposed unspecificity of arousal. Even if reliable emotion-specific physiological response patterns could be detected at the periphery (for which there is, in fact, little evidence; see e.g., Frankenhaeuser, 1975), the individual could still end up with the perception of diffuse arousal due to the relative insensitivity of the feedback system (Zillmann, 1978). Second, physiological arousal that is too low in intensity to be perceived should not contribute to an emotion. Third, since the intensity of perceived arousal is likely to be influenced by a number of factors aside from the intensity of the peripheral physiological reaction (Shields & Stern, 1979), one might expect the intensity of the subjective feeling state to be influenced by the same factors, for example, by the focus of attention (Scheier & Carver, 1977). Finally, it should be noted that Schachter's formulations, specifically his idea that an unexplained state of arousal creates an explanatory search process, are not restricted to physiological arousal, but "[the] conclusions are generalizable to almost any pronounced internal state for which no appropriate explanation is available" (Schachter & Singer, 1962, p. 397). Other internal states to which the theory has been applied have been mentioned in the introduction. Summary According to Schachter, an emotion consists of two components, physiological arousal and a cognition about the arousing situation. Although these two components are necessary conditions for the experience of an emotional state, they are not sufficient; the individual must, in addition, causally attribute the arousal to the cognized emotional source. Furthermore, Schachter specifies two ways in which an emotion can be generated. In everyday life, stimulus events are appraised in an emotional way; this triggers physiological arousal, and THE SCHACHTER THEORY OF EMOTION this arousal is attributed automatically to the eliciting conditions. In contrast, if an individual experiences unexplained arousal first, a causal search process is set into motion; if an emotional source is identified as the cause for arousal, an emotion will be experienced. This latter way of emotion generation is, however, uncharacteristic of everyday emotional experiences. An analysis of the central constructs of Schachter's theory—emotion, cognition, arousal—leads to the conclusion that the theory deals primarily with emotional experience, that cognition refers to an emotional appraisal of a situation or an event, and that arousal refers primarily to introceptively perceived feedback from the periphery. Review of Research Of the predictions that can be deduced from Schachter's theory, the ones that have stimulated most research are the following three: 1. If physiological arousal and/or its feedback is blocked or reduced in intensity during an emotion, then the intensity of the emotional state will be reduced proportionally (theoretically to zero with complete arousal blockage). 2. If an individual can be led to misattribute "irrelevant" (e.g., artificially induced) arousal to an emotional source, then the resultant emotional state will be intensified. 3. If an individual can be induced to misattribute emotionally induced arousal partly or wholly to a nonemotional source, then the intensity of the emotional state will be reduced. These three major hypotheses will be used to organize the ensuing review of empirical research pertinent to Schachter's theory. Effects on Emotion of Reduction of Physiological Arousal Feedback Two groups of studies that have examined the effects of reduced arousal feedback on emotion are relevant in the present context: (a) studies of emotional experience in people with spinal cord injuries, and (b) studies on the effects of adrenergic receptor blocking 245 substances on emotion. A third group of studies in which tranquilizers have been used to reduce peripheral arousal (e.g., Cooper et al., 1978; Schachter&Latane, 1964; Schachter & Wheeler, 1962) will not be reviewed here because the drugs used in these studies (e.g., chlorpromazine) exert their influence mainly through direct action on central nervous system (CNS) structures; therefore, these experiments do not tell much about the role of peripheral arousal in emotion. Emotional experience in spinal cord injured people. Functional transsection of the spinal cord eliminates proprioceptive, cutaneous, and visceral afferent input from a substantial portion of the body (although it does not affect cardiac feedback); therefore, an examination of the emotional experience of spinal cord injured patients seems to be of direct relevance to Schachter's theory. Unfortunately, the amount of published research on this topic is very small and methodologically controversial. Best known is Hohmann's (1966) study, quoted by Schachter himself as a major support for his theory, in which 25 patients with total spinal cord lesions at various levels were asked to compare the intensity of various feelings experienced after the injury with the intensity of comparable pre-injury experiences. For feelings of anger, fear, and sexual excitement, patients reported a decline in intensity of subjective experience, with reductions being more marked the higher the lesion. In a later study, Jasnos and Hakmiller (1975) presented slides of clothed and nude females to 24 male spinal cord injured patients, instructing them to imagine that they were alone with the woman and that she was "sexually available" (this manipulation was effective in significantly increasing heart rate). Subjects were then asked to report their "thoughts and feelings," and the responses were rated by judges as to the degree of expressed emotion. It was found that patients with cervical lesions reported less sexual excitement than those with thoracic or lumbar lesions. Moreover, whereas the latter groups reported significantly more sexual excitement in response to the slides of nude females than to those of clothed ones, the response of cervical patients did not differ. Declines in intensity of experienced sexual excitement, though on a more anecdotal level, have also been reported by Herman (1950). 246 RAINER REISENZEIN On the other hand, Hohmann's (1966) pa- side-effects of alpha-blockers, only betatients also reported that feelings of "senti- blockers have been studied to any extent with mentality" had increased rather than de- regard to their effects on emotional reactions. creased since the injury, and Jasnos and Hak- These latter substances act primarily on the miller (1975) found no differences between cardiovascular system, significantly reducing the different lesion levels in degree of expressed the effects of sympathetic nerve activity and discomfort to slides depicting injuries. In ad- of circulating beta-receptors agonists (N. dition, Dana (1921) studied a patient with le- Weiner, 1980a). In contrast to other drugs sions at the cervical level and found no re- inhibiting sympathetic nervous system activductions in reported intensity of subjective ity, such as chlorpromazine (e.g., Schachter feelings. However, in this case it has been ar- & Wheeler, 1962), however, there seems to gued that the functional transsection of the be no direct effect on the CNS, at least in spinal cord might not have been complete normal doses (Tyrer, 1976). (Fehr & Stern, 1970). Several studies have examined the effects More importantly, methodological prob- of beta-blocking agents on various laboralems of these studies make them difficult to tory-induced anxiety states (Cleghorn, Peevaluate. Apart from obvious problems such terfy, Pinter, & Pattee, 1970; Gottschalk, as experimenter effects and social desirability Stone, & Gleser, 1974; Liu, Debus, & Janke, biases, the implicit assumption underlying 1978; Pinter, Peterfy, Cleghorn, & Pattee, these studies, namely that "were it not for the 1967; Tyrer, 1976). Although in all of these physiological effects of the spinal cord lesion, studies the desired reduction of peripheral present and past experiences would be similar arousal was achieved (as compared with a or identical" (Higgins, 1979, p. 186) must be placebo control), no reductions in reported regarded as extremely tenuous. Considering anxiety were found in any of them. Similar the dramatic life changes that normally result negative results were obtained by Erdmann from a severe spinal cord injury, reports of and van Lindern (1980) for experimentally decreased intensity of feelings could well be induced feelings of anger. Thus, one may cona result of the psychosocial adaptations the clude with the latter authors that "beta-blockpatient has to make, of changes in others' ing agents do not reduce experimentally inreactions, or of any number of causes other duced emotions in healthy subjects" (p. 336). than the injury itself (Higgins, 1979). For exSeveral additional studies assessed the therample, a spinal cord injured person may have apeutic effects of beta-blocking agents on palearned to suppress feelings as a means of tients with moderate to severe anxiety sympcoping with a discouraging and depressing toms (see Jefferson, 1974, for a partial review). reality (Trieschmann, 1980; Tucker, 1980). These studies vary from anecdotal, unconThese factors could also account for differ- trolled case reports to carefully designed douences in felt intensity of emotion between ble-blind trials, and they differ greatly in drug, patients injured at different levels of the dose, patient selection, and assessment techspinal cord, given the more severe handicap niques. It might therefore not come as a surof cervical, as compared with lower-level in- prise that their results are not uniform. Genjured patients. Unless these factors are con- erally it was found that beta-blockers were eftrolled, for example, by comparing spinal fective in reducing experienced physiological cord injured patients with a control group of symptoms, led to improved overall condition patients suffering from a similarly severe and symptom ratings by therapists, and were handicap but without disruption of the au- preferred over placebo by both therapists and tonomic feedback system, results of these patients. More pertinent to the present review, studies must be considered inconclusive. at least two studies found beta-blockers to be Effects of adrenergic receptor blocking effective in reducing subjective feelings of anxagents on emotion. With the development iety and tension, with the effect being comof adrenergic receptor blocking agents (alpha- parable to that of established anxiolytics and beta-blockers), it has become possible to (McMillin, 1973; Wheatley, 1969). However, experimentally reduce peripheral arousal re- as Tyrer (1976) points out, anxiety states in actions in healthy subjects. Due to unwanted general practice tend to improve in the absence THE SCHACHTER THEORY OF EMOTION of specific treatment; since no placebo control group was included in these latter two studies, the relative proportion of the total improvement due to drug action cannot be determined. Furthermore, in other studies that assessed subjective feelings of anxiety it was found that beta-blockers did not affect them (e.g., Granville-Grossman & Turner, 1966), or reduced anxiety only in patients for whom physiological symptoms formed a major part of the complaints (Tyrer & Lader, 1974; see also Tyrer, 1976). Lader and Tyrer (1975; Tyrer, 1976) therefore conclude that the clinical usefulness of beta-blockers with anxiety patients is probably limited to these latter cases and to cases where anxiety is cued by the perception of physiological symptoms in thefirstplace (e.g., heart neurotics; see Besterman & Friedlander, 1965; Nordenfelt, 1965; Nordenfelt, Persson, & Redfors, 1968). In sum, results from studies examining the effects of beta-blocking agents on emotional states provide only very limited support for Schachter's theory. It must be kept in mind, however, that these studies certainly do not provide what would be an ideal test of the hypothesis under consideration. That is, numerous sources of autonomic feedback are left unaffected by beta-blocking agents. On the other hand, if the link between arousal and emotional experience were really as tight as implied by Schachter's theory, then the reduction of cardiovascular feedback accomplished by beta-blockers would seem to be sufficient to result in a statistically significant reduction in the intensity of the emotional state, especially because other research suggests that cardiovascular feedback accounts for some of the most salient components of subjectively experienced arousal (see, e.g., Fahrenberg, 1965; Shields & Stern, 1979). Misattribution of "Irrelevant" Arousal to an Emotional Source Studies that have attempted to lead subjects to misattribute irrelevant arousal to an emotional source can be conveniently divided into three subgroups according to the method by which arousal has been induced: (a) studies using drug-induced arousal; (b) studies using transferred excitation from 247 prior stimulation; and (c) studies using simultaneously presented external stimuli to induce irrelevant arousal. Misattribution of drug-induced arousal. Beginning with Schachter and Singer (1962), a number of misattribution studies have examined the effects of drug-induced arousal on emotions. Following Schachter and Singer's lead, the standard paradigm of these studies consists of administration of an arousing drug, such as adrenaline, isoprenaline, ephedrine, or amphetamine, in a situation containing some either explicitly or potentially emotional cues. At the same time, the true source of arousal is disguised by suitable cover stories and by either not informing or misinforming subjects about the drug's physiological effects. It should be noted that although these drugs all simulate, more or less perfectly, the results of sympathetic stimulation, amphetamine and ephedrine may also have marked central effects such as wakefulness and euphoria (N. Weiner, 1980b); thus, these latter drugs are only of restricted value in tests of Schachter's theory. Schachter and Singer (1962) injected subjects with either adrenaline or placebo. Adrenaline-injected subjects were given, in addition, either incorrect or no information (misattribution groups), or correct information concerning the physiological consequences of the injection. All subjects were then exposed to a situation that was designed to provide cognitive cues suggestive of an emotional labeling of their arousal. For half of the subjects, this consisted of a confederate acting in a euphoric manner; for the other half, the confederate displayed angry behavior. Observations of subjects' verbal and nonverbal behavior in these situations, as well as self-ratings of experienced affect, served as the dependent variables. Results showed that the expected differences in emotionality between the misattribution and the placebo control groups were found for the behavioral index only in the anger condition. Exclusion of subjects in the misattribution groups who attributed their perceived arousal to the injection despite the attempts to disguise the true source ("self-informed") resulted in additional significant differences for self-ratings in the anger condition, as well as for the behavioral index in the euphoria condition. However, the 248 RAINER REISENZEIN absolute magnitude of the obtained effects was rather small, especially for the self-ratings, where the maximum difference between any of the groups was only .9 on a 9-point scale ranging from "very angry" to "very happy." Moreover, and inconsistent with the predictions, all groups fell on the positive side of this scale. Numerous criticisms of this study have been raised (e.g., Kemper, 1978; Lazarus, 1968; Leventhal, 1974; Manstead, 1979; Marshall & Zimbardo, 1979; Maslach, 1979; Plutchik & Ax, 1967; Stricker, 1967; Zimbardo et al., 1977). Space limitations prevent a discussion of these various criticisms, but when reading them it becomes evident that a control of possible deficiencies could either have strengthened Schachter and Singer's conclusions or weakened them. Recent replications of Schachter and Singer's experiment (Marshall & Zimbardo, 1979; Maslach, 1979) suggest that the latter is more likely the case. Marshall and Zimbardo (1979) replicated Schachter and Singer's "euphoria" condition, using an adrenaline-injected misinformed group as well as placebo control group. In addition, two more groups receiving a somewhat stronger mean dose of adrenaline and two additional control groups were run. Schachter and Singer's results were not replicated. Instead, the misattribution groups showed a feeling change toward the negative; this change was significant for the higher dosage groups. Similar but weaker results were obtained for a behavioral index. In response to this study, Schachter and Singer (1979) suggested that the symptoms described to subjects in the misattribution groups actually constitute some of the subjectively experienced symptoms of adrenaline injections; these groups should therefore be considered correctly informed, rather than misinformed, and no misattribution effect can consequently be expected. Actually, however, manipulation checks by Marshall and Zimbardo indicate that although some "self-information" did occur in these groups, the majority of subjects did not spontaneously attribute their perceived arousal to the injection, and there were no significant differences in measured emotionality between self-informed and not self-informed subjects. Thus, Schachter and Singer's criticism does not in- validate Marshall and Zimbardo's findings. In addition, these findings are further corroborated by Maslach (1979), who replicated both of Schachter and Singer's emotional conditions, using hypnotically induced arousal. Posthypnotic suggestions of amnesia were used to prevent subjects from attributing their arousal to the true source. It was found that subjects in the arousal conditions who were left unaware of the cause of their arousal experienced a significantly more negative emotional state than those who did not experience arousal or were in a control group that was not given posthypnotic amnesia suggestions. The confederate's behavior was not found to affect reports of subjective feelings. It did, however, exert an influence on subjects' overt behavior, reminiscent of the frequently observed lack of concordance between subjective experience and overt action (e.g., Hodgson & Rachman, 1974; Rachman & Hodgson, 1974). In response to these results, Schachter and Singer (1979) specifically criticized the timing of arousal in Maslach's study. In fact, it seems that arousal symptoms were experienced by subjects before the confederate started enacting emotional behavior; one should not expect misattribution under such circumstances. Maslach (1979) has rebutted these criticisms with several arguments, including reference to an unpublished study in which the same results were obtained when these problems of timing had been rectified. Until this study can be examined further, however, one is forced to conclude that the ramifications of Maslach's original experiment must remain somewhat ambiguous. A number of further studies using essentially the same experimental paradigm have examined the effects of drug-induced arousal on such diverse emotional states as experience of humor (Schachter & Wheeler, 1962), fear and anxiety (Bandura & Rosenthal, 1966; Erdmann & Janke, 1978; Gerdes, 1979; Rogers & Deckner, 1975; Schachter & Lantané, 1964; Tyrer, 1976), anger (Erdmann & Becker, 1978; Erdmann & Janke, 1978; Erdmann & van Lindern, 1980; O'Neal & Kaufman, 1972), elation (Erdmann & Janke, 1978), emotional reactions and attitude change in psychotherapy (Hoehn-Saric et al., 1974), and the experience of cognitive dissonance (Cooper, Zanna, & Taves, 1978). THE SCHACHTER THEORY OF EMOTION Of these studies, those by Cooper et al. (1978), Gerdes (1979), Hoehn-Saric et al. (1974), Schachter and Latané (1964), and Schachter and Wheeler (1962) did indeed obtain some indication of an intensified emotional state in subjects administered an arousing drug (as compared with a placebo control), but the evidence is either relatively weak or indirect. Specifically, in the study of Cooper et al. it was found that subjects who had been administered amphetamine and were then asked to write a counterattitudinal essay subsequently changed their attitudes more in the direction implied by their behavior than subjects who had been given a placebo; from this it was inferred that the state of cognitive dissonance, which is conceived by these authors as an aversive subjective state similar to an emotion, had been intensified by the drug-induced arousal. Hoehn-Saric et al. found that adrenaline-administered subjects described themselves as significantly more "physiologically or emotionally" aroused during a stressful therapeutic session than placebo subjects, leaving the exact meaning of these reports open to interpretation. In Schachter and Latane's experiment, the predicted results were obtained only on a behavioral index for psychopathic criminals, but not for nonpsychopathic criminals and a student control group. Schachter and Wheeler (1962) found the expected differences between adrenaline and placebo subjects only for the more extreme categories of an index of expressive behavior, but not for subjective measures (stimulus evaluations). Clear evidence for an enhancement of emotional experience in drug-administered subjects was obtained only by Gerdes (1979), and then only for male subjects. In evaluating these results, attention should be drawn to the minimum two requirements that a study has to meet to provide an adequate test of the misattribution hypothesis: (a) the arousal manipulation must be effective, that is, significantly more arousal must be present in the experimental (misattribution) group than in the placebo control group, and (b) the misattribution manipulation must be effective, that is, subjects must indeed attribute their arousal to the emotional source. A reexamination of the studies reviewed above in terms of these two criteria 249 reveals that the arousal manipulation was clearly not effective in the studies by Erdmann and Becker (1980) and O'Neal and Kaufman (1972), and possibly also in the experiment by Erdmann and Janke (1978). As far as the attribution manipulation is concerned, it was ineffective in Gerdes' (1979) study for females, as well as in Marshall and Zimbardo's (1979) and Maslach's (1979) experiment. Although in the latter experiments the majority of subjects did not attribute their arousal to the nonemotiorial source, this does not mean that they positively attributed it to the emotional cues present; in fact, it appears that such was not the case in both of these studies. Generally, the possibility of a failure of the arousal and/or the misattribution manipulation cannot be excluded for all studies in which appropriate manipulation checks were not utilized. Evidence from manipulation checks which indicated that both manipulations were effective is in fact available only for male subjects in Gerdes' (1979) study, and in this case, intensification of fear experience was also found. Quite possibly, therefore, several of the reported studies that obtained null results simply did not provide an adequate test of the misattribution hypothesis. In addition to the studies just reviewed, mention must be made of the considerable number of "pre-Schachterian" adrenalineinjection experiments (e.g., Cantril & Hunt, 1932; Dynes & Tod, 1940; Frankenhaeuser & Jaerpe, 1963; Frankenhaeuser, Jaerpe, & Matell, 1961; Landis & Hunt, 1932; Lindemann & Finesinger, 1938; Marañon, 1924; Pollin & Goldin, 1961; see Breggin, 1964, for a partial review). Although these studies were, of course, not designed as misattribution studies, there is the possibility that in some of them, misattribution effects were inadvertently created. More specifically, three types of reactions to adrenaline injections could be observed in these studies: reports of physiological symptoms only; reports of "cold" or "as-if" emotions; and reports of "genuine" emotional experiences, mostly of anxiety. Furthermore, as far as such genuine feelings of anxiety are concerned, it appears that they were more likely; the more stressful elements were present in the experimental situation, the more the subjects were predisposed toward anxiety (e.g., chronically anx- 250 RAINER REISENZEIN ious patients; Breggin, 1964), and the more they were left unaware about the effects of the injections. One might, therefore, speculate that these genuine fear experiences were due to an inadvertently created misattribution effect. However, this post hoc interpretation should be regarded with considerable caution, as it is equally likely that the feelings of anxiety were cued by perceived physiological symptoms in the first place (Breggin, 1964). In addition, in some of these studies genuine emotions were reported despite the fact that subjects clearly knew about the source of their arousal, which is inconsistent with a misattribution explanation. In sum, studies using drug-induced arousal provide some, but hardly strong and consistent, evidence for a misattribution effect. However, it seems that this can at least in part be explained by manipulation failures. Apparently, it is more difficult to experimentally create the preconditions for misattribution effects (at least for drug-induced arousal) that has been assumed by Schachter (1964). Misattribution of transferred excitation. The paradigm underlying the studies reviewed in this section, the so-called excitation transfer paradigm, was originally developed by Zillmann (1971). Essentially, it constitutes an application of Schachter's theory to states of arousal occurring sequentially. It is based on the well-established fact (e.g., Cantor, Zillmann, & Bryant, 1975; Donnerstein & Hallam, 1978; Zillmann, 1971; Zillmann & Bryant, 1974; Zillmann, Katcher, & Milavsky, 1972) that physiological arousal does not terminate abruptly at the cessation of the eliciting conditions; instead, because of slow, humoral processes involved in the control of sympathetic arousal, excitation decays relatively slowly. Therefore, if an individual has been physiologically aroused in situation A, and finds him- or herself subsequently in emotion-provoking situation B, residual arousal from A may still be present in B and add to the arousal elicited by the emotional stimuli themselves; thus the total arousal level experienced in B is elevated. (As a simplifying assumption, one can think of this integration of residual and newly generated arousal as being roughly additive; see Zillmann, 1979). Zillmann has suggested that, under specific circumstances discussed in more detail below, an individual might come to attribute the total arousal present in B to the emotional stimuli and that in this case, the emotional reaction will be intensified through what is "essentially a misattribution in situation B of the residual excitation from A" (Tannenbaum & Zillmann, 1975, p. 181). In line with these predictions, engaging in strenuous physical exercise has been found to significantly enhance hostile aggressive reactions in response to provocation, both when subjects engaged in the exercise before they were provoked (Zillmann & Bryant, 1974), or between provocation and opportunity to retaliate (Zillmann, Johnson, & Day, 1974; Zillmann et al. 1972). Prior physical exercise has also been shown to enhance sexual excitement in response to erotic films (Cantor et al., 1975), to increase males' judgments of attractiveness, liking for, and "romantic attraction" toward an attractive female, and to decrease those judgments when the female was unattractive (White, Fishbein, & Rutstein, 1981, Exp. 1), and to intensify negative mood induced by the reading of negative self-referenced statements (Reisenzein & Gattinger, 1982). Furthermore, prior exposure to either positively or negatively toned arousing emotional material was found to significantly enhance subsequent appreciation of music (Cantor & Zillmann, 1973), dysphoric empathy in response to a sad movie (Zillmann, Mody, & Cantor, 1974), judgments of funniness of cartoons (Cantor, Bryant, & Zillmann, 1974; but see Suls, 1976), and males' judgments of attractiveness, liking for, and romantic attraction toward an attractive female (White et al., 1981, Exp. 2); again, these latter judgments were decreased if the female was unattractive. Similarly, startle-induced arousal was found to significantly increase males' judgment of attractiveness and liking for an attractive female experimenter, as well as females' judgments of an attractive male experimenter, while decreasing those evaluations if both subject and experimenter were male (Dienstbier, 1979a). Aggressive reactions in response to provocation were found to be significantly enhanced by prior exposure to uncontrollable loud noise (Donnerstein & Wilson, 1976, Exp. 2), arousing aggressive films (Donnerstein, Donnerstein, & Barrett, 1976), arous- THE SCHACHTER THEORY OF EMOTION ing erotica (Cantor, Zillmann, & Einsiedel, 1978; Donnerstein, Donnerstein, & Evans, 1975) and other arousing films (Bryant & Zillmann, 1979). Aggression-enhancement effects have also been reported for arousing erotic and aggressive communications interpolated between provocation and opportunity to retaliate (Baron, 1979; Day, 1976; Donnerstein, 1980; Donnerstein & Barrett, 1978; Donnerstein & Hallam, 1978; Meyer, 1972; Zillmann, 1971; Zillmann, Hoyt, & Day, 1974). In other studies using the same paradigm, nonenhancement effects of interpolated arousing communications were found (Bryant & Zillmann, 1977; Donnerstein et al., 1975; Donnerstein et al., 1976; Zillmann & Sapolsky, 1977) but, as will be explained in more detail below, an excitation transfer effect might nonetheless have been involved. On the other hand, if subjects were treated favorably or just not provoked, rather than being provoked by a confederate after they had been exposed to arousing erotic films, they rewarded the confederate more when given an opportunity to do so (Jaffe, 1981; Mueller & Donnerstein, 1981). Finally, three studies, though not intended as tests of the excitation transfer model, also showed results consistent with it: Rimm, Kennedy, Miller, and Tchida (1971) obtained evidence that snake-phobic subjects mastered significantly fewer steps in a graded behavioral approach test when first emotionally aroused than when not; Hoon, Wincze, and Hoon (1977) found that females' sexual arousal in response to erotica was intensified by prior exposure to fear-eliciting stimuli; and Dermer and Pyszczynski (1978, Exp. 1) found that males' expressed feelings of love (measured by the Rubin love scale) for women with whom they were romantically involved were significantly enhanced by prior exposure to arousing erotica. At first sight, then, there seems to be impressive evidence for the excitation transfer model. Upon closer examination, however, several problems become apparent. To begin with, there is reason to believe that the observed intensification of emotional reactions in some of these studies was not mediated by mere transferred excitation, but rather by an emotional state induced by the prior stimuli. For example, it is known that loud uncon- 251 trollable noise is experienced as subjectively aversive (see, for example, Glass, Singer, & Friedman, 1969); therefore, the observed intensification of aggression in the Donnerstein and Wilson (1976, Exp. 2) study might have been mediated by this emotional effect (e.g., by rendering subjects more sensitive to provocation). This interpretation would be consistent with the results of experiments investigating the effects of noise on helping (Sherrod & Downs, 1974; Yinon & Bizman, 1980; see below). Similarly, increases in prosocial behavior following exposure to erotic communications (Jaffe, 1981; Mueller & Donnerstein, 1981) could have been mediated by a positive emotional state induced by these communications (see, e.g., Zillmann & Sapolsky, 1977). This enhancement effect of positive mood on prosocial behavior is well documented (e.g., Staub, 1978). Note, however, that this alternative explanation can clearly not account for the results of those studies that used physical exercise to induce arousal (a procedure that has been shown to be affectively neutral; White et al., 1981), as well as of those experiments that used both negative and positive emotional materials (e.g., Cantor et al., 1973) and those that found aggression-enhancement effects of erotica (e.g. Cantor et al., 1978). Further problems of interpretation pertain specifically to the aggression studies reviewed above. First, there is little evidence that the subjective experience of anger was also intensified in these experiments. Of those that measured the experience of anger and annoyance at all, only Donnerstein et al. (1976) reported effects that paralleled the behavioral data. Quite possibly, however, this absence of effects on subjective measures could be due to the fact that subjective experience was always assessed after the retaliatory opportunity; at this time, anger might already have substantially declined. In addition, the rating scales might have been too crude, or subjects might have been unwilling to admit their anger (Younger & Doob, 1978). Whatever the reason, the interpretation of the results of these studies in terms of an excitation transfer effect would be considerably strengthened if clear evidence for an enhancement of subjective feelings of anger could be obtained (Rule et al., 1979). Second, additional in- 252 RAINER REISENZEIN terpretive problems are associated with those experiments in which subjects were exposed to arousing communications between provocation and opportunity to retaliate. There is evidence that such communications are not only arousing, but may also divert subjects' attention away from their provocation-related angry cognitions, thereby decreasing anger arousal (Donnerstein et al., 1975). This may in fact have occurred in those studies that showed nonenhancement effects (Bryant & Zillmann, 1977; Donnerstein et al. 1975, 1976; Zillmann & Sapolsky, 1977). Furthermore, as far as erotic communications are concerned, they might have, as mentioned above, induced a positive emotional state which was hedonically incompatible with the negative feelings of anger and annoyance and thereby reduced hostile aggression (Baron & Byrne, 1977; Zillmann & Sapolsky, 1977). Thus, in order to assess the relative importance of excitation transfer effects in studies of this kind, careful measurement of the arousal-inducing, attention-diverting, and emotion-inducing properties of the interpolated communications seems essential. Furthermore, in order to correctly identify observed differences in aggressiveness as reduction or intensification, it is essential to run an appropriate control group, that is a group of subjects who are either left waiting between provocation and opportunity to aggress, or are exposed to nonarousing, emotionally neutral, and not attention-diverting tasks or communications (cf. Bryant & Zillmann, 1977). Due to the absence of adequate pretesting of the communications used and/or absence of an adequate control group, interpretation of some of these aggression studies as evidence for excitation transfer is ambiguous. Finally, it is important to point out that even the clear demonstration of excitation transfer effects in humans does not in itself imply the existence of the hypothesized mediating attributional process (Zillmann, 1978). It could be argued that the findings above might be more parsimoniously explained by a drive-theoretical model, positing that the pooled arousal simply functions as a "general response energizer," intensifying whatever response is dominant in the response hierarchy in the particular situation (Hull, 1943; Spence, 1956; see also Tannenbaum & Zillmann, 1975). However, apart from the fact that the drive model, strictly speaking, does not extend to conscious experience (and therefore could at best explain only the behavioral results of these studies), data are available that contradict this simple interpretation and favor the attributional model. Specifically, it has been repeatedly observed that an excitation transfer effect does not occur if individuals are placed in an emotional situation immediately after they have been exposed to arousing conditions; an excitation transfer effect does occur, however, if a short period of recovery is interpolated between the two arousing conditions (Baron & Bell, 1977; Cantor & Zillmann, 1973; Cantor et al., 1975; Day, 1976; Zillmann, Johnson, & Day, 1974; Zillmann, Mody, & Cantor, 1974). This phenomenon is exactly opposite to what one would expect if the drive model were correct, because the intensity of arousal is undoubtedly stronger immediately after the termination of the prior inducing stimulation than after the recovery period. The misattribution of arousal model, in contrast, can neatly explain these findings (Zillmann, 1978). It is assumed that excitation transfer effects will occur only if the individual does not causally connect the residual state of excitation to the prior inducing source. According to Zillmann, such "correct" attribution is in turn highly likely as long as the individual experiences strong arousal feedback cues (such as heavy breathing, heart pounding, etc.) that link the perceived arousal to the prior inducer. Such was presumably the case in the no-delay conditions of the experiments mentioned above. That is, immediately after the first arousalinducing stimulation, arousal feedback cues were still salient and in focal awareness; therefore, they virtually forced the individual into attributing the perceived arousal to the inducing condition. After a recovery period, in contrast, the intensity of arousal had somewhat declined and obvious arousal cues were no' longer salient; thus, misattribution became possible. More direct evidence for this hypothesis comes from the studies by Cantor et al. (1975) and Reisenzein and Gattinger (1982). In Cantor et al.'s study, it was found that there is a threshold for awareness of re- THE SCHACHTER THEORY OF EMOTION sidual arousal; specifically, subjects thought their arousal from physical exercise had already declined to baseline at a time when, objectively, it was still significantly elevated. An excitation transfer effect was subsequently found for erotic films presented at this point, but not for films presented immediately after the exercise. Reisenzein and Gattinger found that increasing the salience of arousal by a manipulation of attentional focus (see Carver, 1979; Gibbons, Carver, Scheier, & Hormuth, 1979) significantly reduced the frequency of misattribution and eliminated the excitation transfer effect. Certainly, however, these findings should not be interpreted to mean that intensity of residual arousal is the only factor that influences excitation transfer. Other important factors might include the prior experience of subjects with similar situations, the ego-involving capacity of cues, and the salience and plausibility of alternative causes (Rule et al., 1979). In fact, it has been found that even intense arousal can be misattributed if the alternative cause is made highly salient to subjects (White et al., 1981). In sum, the studies reviewed in this section have demonstrated that exposure to prior arousing stimulation can intensify a great variety of subsequent emotional states. Despite interpretive problems associated with a number of these studies, the existence of excitation transfer effects appears to be well documented. In addition, there is evidence supporting the hypothesis that these effects are indeed mediated by a process of causal attribution. Misattribution of arousal from a simultaneously present external source. Results from excitation transfer experiments suggest that misattribution of arousal is unlikely to occur if the source of that arousal is salient to an individual at the point of potential misattribution. From this one might expect misattribution to be unlikely in a situation where the source of irrelevant arousal is simultaneously present with a relevant emotional source, insofar as the external presence of the true source should usually make it salient to the individual (Kenrick & Cialdini, 1977). It has been argued, however, that this is not always the case. Specifically, if the source of irrelevant arousal is atypical, if the 253 individual has only limited experience with it, and/or if the simultaneously present emotional cues are highly attention-attracting, misattribution might occur even in this case. Consistent with this reasoning is the finding that exposure to loud noise during retaliation significantly increases provoked subjects' aggressiveness (Donnerstein & Wilson, 1976, Exp. 1; Konecni, 1975). Furthermore, Dutton and Aron (1974) reported results from two field and one laboratory experiment suggesting that males' sexual attraction toward an attractive female was increased under fear-eliciting circumstances, and Kenrick and Johnson (1979) found that attraction ratings of another subject were significantly intensified under high noise when the other was physically present; in contrast, high noise lowered evaluations of a not physically present person. These latterfindingsare consistent with a misattribution explanation if it is assumed that a physically present person elicits a positive emotional reaction to begin with, whereas a not physically present person elicits a negative one, which was in fact the case in Kenrick and Johnson's experiment (cf. White et al., 1981). It has also been suggested that violations of personal space (Worchel & Teddlie, 1976) and, more generally, violations of a comfortable, situationally appropriate level of "intimacy behavior" (including, in addition to space violations, things such as increased eye contact, forward leaning, smiling, etc.; Patterson, 1976), elicit physiological arousal (evidence supporting this suggestion comes from a number of studies, e.g., Aiello, Epstein, & Karlin, 1975; Coutts, Schneider, & Montgomery, 1980; D'Atri, 1975; McBride, King, & James, 1965; Schaeffer& Patterson, 1980), which can then intensify whatever emotional reactions are induced by the context through what is essentially a misattribution of arousal process. Supporting this suggestion, Schiffenbauer and Schiavo (1976) and Storms and Thomas (1977) found that close interpersonal distances increased evaluations of interaction partners if the interaction was of a positive nature and decreased them if the interaction was negative in character. No effect was found when the interaction was neutral (Schiffenbauer & 254 RAINER REISENZEIN Schiavo, 1976). Evidence was also obtained that subjects spent less time talking to an interaction partner at close distance if the partner was described as dissimilar in attitudes (Storms & Thomas, 1977). Furthermore, the subjective experience of crowding and confinement was enhanced by high gaze level from others most when these others were believed to be dissimilar in attitudes (Schaeffer & Patterson, 1980). Baron and Bell (1976b) and Baron (1978) found that emotional reactions to another person requesting help were significantly more positive and amount of help given was larger under close than under far interpersonal distance when need was high; however, when need was low and the helping request was therefore probably perceived as illegitimate, a trend in the opposite direction was obtained (Baron, 1978). Furthermore, several studies found that a person standing close to another at a crosswalk induced significantly greater feelings of uneasiness, produced increased crossing speed, and was later helped less than a person standing farther away (Konecni, Libuser, Morton, & Ebbesen, 1975; Smith & Knowles, 1978, 1979). This was, however, not the case if the invader appeared to be an artist sketching a drawing, thus motivating a different interpretation of the space invasion (Smith & Knowles, 1979). As evidence for the misattribution of arousal model, however, these findings must be considered inconclusive. Concerning the studies by Dutton and Aron (1974), it appears that their field experiments are beset by significant methodologicalflaws(see Kenrick & Cialdini, 1977), and the results of the laboratory experiment (Dutton & Aron, 1974, Exp. 3) could not be replicated in four studies, including one exact replication (Kenrick, Cialdini, & Linder, 1979). Whether the aggression-enhancing effect of concurrent noise (Donnerstein & Wilson, 1976, Exp. 1; Konecni, 1975) was due to misattribution of noise-induced arousal can be questioned on the grounds that noise has been found to reduce helping behavior (rather than to increase it, as would be expected if the misattribution hypothesis were correct) in at least two studies (Sherrod & Downs, 1974; Yinon & Bizman, 1980). As mentioned before, these findings could be more consistently ex- plained in terms of the mediation of negative affect. It might be noted in this context that negative affect, rather than misattributed physiological arousal, has also been found to be a better explanation for the observed effects of heat stress on aggressive behavior (see Baron & Bell, 1976a; Bell, 1981; Rule & Nesdale, 1975). As to the intimacy studies, they too fail to rule out plausible alternative hypotheses. One hypothesis that could account for most, if not all, of thefindingsof these experiments is that increased intimacy induces heightened levels of attention and that these, in turn, serve to magnify the impact of emotional stimuli, helping requests, and so on (Baron, 1978). It is also sometimes unclear to what extent it was the intimacy violation per se, as opposed to the Cognitive interpretation of that violation (e.g., concerning the violator's motives), that elicited arousal and emotional reactions (see Smith & Knowles, 1979). Further research is needed to explore these possibilities. This research should also include measures designed to tap the hypothesized mediating processes (e.g., attribution). At present, the evidence from the studies reviewed in this section, though consistent with a misattribution explanation, is not conclusive about the mediating mechanism. Misattribution of Emotionally Induced Arousal to a Neutral Source Experiments that have attempted to induce subjects to misattribute emotionally induced arousal to a neutral source have generally relied on one of two paradigms, one originally developed by Nisbett and Schachter (1966) and the other by Ross et al. (1969). In both of these paradigms, subjects are exposed to emotionally arousing stimuli, while a different (nonemotional) cause for perceived arousal is made salient to them. More specifically, subjects in the misattribution groups in these paradigms are either given a placebo described as. an arousal-producing drug (Nisbett & Schachter, 1966) or are exposed to noise that is described as having arousing side-effects (Ross et al., 1969). For subjects in the control groups, the placebo or noise is described as producing no symptoms at all, or arousal-irrelevant symp- THE SCHACHTER THEORY OF EMOTION toms such as itching. The underlying rationale is that this way the "drug" or noise becomes salient as an alternative cause for perceived, and actually emotionally induced, arousal symptoms for subjects in the misattribution condition. Therefore, these subjects might be led to discount (Kelley, 1972) the extent to which the emotional source contributed to the perceived arousal. As a result, the intensity of the emotional reaction should be reduced. In line with this reasoning it has been shown that subjects in the misattribution, as compared with the control, condition evidenced increased shock tolerance and reported shocks to be less painful (Nelson, 1971; Nisbett & Schachter, 1966); low-fear subjects showed decreased shock-avoidance behavior (CalvertBoyanowsky & Leventhal, 1975; Ross et al., 1969; M. J. Weiner, 1971), reported less subjective fear and discomfort (Girodo, 1973; Loftis & Ross, 1974a, Exp. 2; M. J. Weiner, 1971; M. J. Weiner & Samuel, 1975), and showed increased task performance in stressful situations (Rodin, 1976; M. J. Weiner & Samuel, 1975). Furthermore, subjects in the misattribution condition displayed less aggressive behavior in response to provocation (Harris & Huang, 1974a; Younger & Doob, 1978) and showed attenuated subjective emotional reactions (Batson, Duncan, Ackerman, Buckley, & Birch, 1981) as well as reduced altruistic behavior toward a person in need of aid (Batson et al., 1981; Coke, Batson, & McDavis, 1978, Exp. 1; Gaertner & Dovidio, 1977, Exp. 2; Harris & Huang, 1973). In addition, a misattribution treatment was found to decrease the subjective experience of crowding in close interaction situations (Worchel & Yohai, 1979), to increase cheating at an ego-involving examination (Dienstbier, 1972; Dienstbier & Munter, 1971), to facilitate abstinence from smoking (Barefoot & Girodo, 1972), and to alleviate insomnia (Storms & Nisbett, 1970), heart neurotics' complaints (Liebhart, 1974), and shyness-related behavior in shy people (Brodt & Zimbardo, 1981). A misattribution treatment was also found to significantly reduce attitude change in a forced compliance paradigm, presumably by reducing the intensity of experienced dissonance (Higgins, Rhodewalt, & Zanna, 1979; Zanna & Cooper, 1974; Zanna, Higgins, & Taves, 255 1976), and to decrease both derogation of an intelligence test and lack of effort attributions following negative performance feedback (Fries & Frey, 1980), presumably by reducing the intensity of experienced negative emotion induced by the negative feedback. Finally, Loftis and Ross (1974a, 1974b) reported that a misattribution manipulation facilitated extinction of a classically conditioned galvanic skin response reaction, regardless of whether the manipulation was introduced during acquisition trials (Loftis & Ross, 1974a, Exp. 2) during extinction (Loftis & Ross, 1974a, Exp. 1), or even retrospectively after acquisition for the preceding conditioning trials (Loftis & Ross, 1974b). There are, however, also a number of studies reported that did not find a misattribution effect. Zuckerman (1974) failed to obtain a misattribution effect for subjects with dental fear; Singerman, Borkovec, and Baron (1976) with speech-anxious subjects; Holroyd (1978) with test-anxious subjects; and Harris and Huang (1974b) for sexual excitement in response to erotica. Furthermore, Storms and Nisbett's (1970) study, which suggested a beneficial effect of misattribution on insomnia, has been severely criticized on methodological grounds (e.g., Bootzin & Nicassio, 1978), and could not be replicated in four studies (Bootzin, Herman, & Nicassio, 1976; Heffler & Lisman, 1978; Kellogg & Baron, 1975; Lowery, Denney, & Storms, 1979); and Barefoot and Girodo's (1972) finding that a misattribution treatment facilitated abstinence from smoking was not supported when more stringent behavioral criteria were used (Chambliss & Murray, 1979). At least part of these negative findings might be explained by manipulation failures; that is, either the emotional stimuli presented to subjects failed to elicit noticeable arousal, as in Harris and Huang's (1974b) study (evidently no misattribution effect can be expected under such circumstances, cf. Dienstbier, 1972; Dienstbier & Munter, 1971; Rodin, 1976), or the attempts to influence subjects' attributions of arousal remained unsuccessful (Heffler & Lisman, 1978; Singerman et al., 1976; cf. Nisbett & Schachter, 1966, high-fear subjects). In addition, it could be argued that target behaviors such as sleep-onset latencies (in the insomnia studies) or cigarette 256 RAINER REISENZEIN consumption (Chambliss & Murray, 1979) are quite removed from any emotional state purportedly mediating those behaviors; as Ross and Olson (1981) point out, such behavioral variables should not be expected to be as easily influenced by a misattribution manipulation as variables more closely related to the emotional state. From a practical point of view, these failures to obtain misattribution effects are important insofar as they include most of the attempts to influence by a misattribution manipulation clinically relevant target behaviors. Hence, the data do not seem to justify enthusiasm concerning the therapeutic usefulness of misattribution treatments (Ross & Olson, 1981). More significant from a theoretical point of view, however, is the fact that the misattribution explanation of these findings has been challenged, and alternative plausible hypotheses have been offered. For the purpose of this review, these rival hypotheses are termed the "attention-diversion hypothesis" and the "preparatory information hypothesis". According to the attentiondiversion hypothesis (e.g., B. Weiner, 1980; see also, Loftis & Ross, 1974b), arousal symptoms described to subjects in the experimental groups are more alarming, interesting, or surprising than the arousal-irrelevant symptoms described to subjects in the control groups; therefore, they direct subjects' attention to the misattribution source and/or to the self and decrease attention to the emotional cues present. As a result, the impact of the emotional stimuli is attenuated. The preparatory information hypothesis, on the other hand, asserts that correct information about to-be-expected symptoms in a stressful situation reduces uncertainty and ambiguity by leading to accurate expectations regarding the stressor, and this, in turn, attenuates subsequent stress reactions (Calvert-Boyanowsky & Leventhal, 1975; Rodin, 1976). What these two hypotheses have in common is the suggestion that the reduction in emotionality observed in the misattribution studies was due to the different symptom information presented to subjects as part of the misattribution manipulation (by either diverting their attention away from the emotional stimuli or altering the appraisal of those stimuli) and not to attributions regarding those symptoms. Evidence supporting this suggestion comes from experiments by Calvert-Boyanowsky et al. (1975) and Rodin (1976). In Calvert-Boyanowsky et al.'s (Exp. 1) study, different groups of subjects were provided either with a list of arousal symptoms or a list of arousalirrelevant symptoms, the symptoms being described either as typical effects of the emotional (shock) or the nonemotional (noise) source. The only significant effect found was a main effect for type of symptom information, suggesting that the provision of arousal symptom information, rather than attribution of the symptoms, accounted for the reduction in emotionality. However, manipulation checks suggest that the attributional manipulation itself might have been ineffective, thus leaving the possibility that if it had been effective, it might at least have had an additional effect. This speculation is contradicted, however, by thefindingsof Rodin (1976). In this case, manipulation checks suggest that the attribution manipulation was effective. Nevertheless, it was again found that subjects who had been given arousal symptom information showed less stress, regardless of attribution, than control subjects. In addition, M. J. Weiner (1971) found that a reduction in emotionality was obtained even if the supposedly arousing placebo was administered after subjects had been informed that they would receive shocks, a timing that should actually have prevented misattribution (see Ross & Olson, 1981). These findings, together with the fact that there is hardly any direct evidence for attributional mediation in the misattribution studies reviewed above (Nisbett & Wilson, 1977), justify doubts concerning the adequacy of the misattribution hypothesis. They do not, however, provide any clear information as to which of the above-mentioned alternative hypotheses, if any, accounts for the findings. Additional evidence is available that supports both of these hypotheses. The attention-diversion hypothesis is substantiated by results from Girodo (1973), who found that subjects given correct (i.e. arousal) symptom information and exposed to a feareliciting film not only felt significantly less THE SCHACHTER THEORY OF EMOTION discomfort but also called significantly fewer details of the film content than subjects given irrelevant symptom information. Furthermore, Worchel and Teddlie (1976) found that the experience of crowding was significantly reduced in a close interaction situation if the room contained a number of presumably distracting pictures and posters. Studies in different experimental contexts suggest, in addition, that distraction can be effective in reducing various types of stress reactions (Leventhal, 1979; Thompson, 1981). As to the preparatory information hypothesis, numerous studies have demonstrated that preparatory sensory information can be effective in reducing various kinds of stress reactions (Leventhal, 1979), and these effects seem to be different from and not reducible to attentional diversion (Johnson, 1973; Leventhal, 1980). In sum, in the studies reviewed in this section, a relatively robust phenomenon was detected: Subjects who underwent a misattribution manipulation subsequently showed reduced emotionality in a variety of situations and on a variety of indicators. The interpretation of these findings in terms of a misattribution effect is, however, thrown into doubt by results obtained in the few studies that have attempted to systematically test the misattribution hypothesis against alternative explanations. Although this does not mean that the misattribution hypothesis has been shown to be invalid (see Dienstbier, 1979b, and Ross and Olson, 1981, for attempts to deal with some of the issues raised),2 it does suggest that until further evidence is available, the status of the misattribution hypothesis should best be considered equivocal, and both an attentional diversion and a preparatory information hypothesis (or a combination of both) should be considered plausiblble alternative hypotheses. Discussion The results of the foregoing review of research can be summarized in two main points: 1. Of the three major empirical deductions from Schachter's theory that have been reviewed, only the second one (claiming that an emotional state will be intensified by mis- 257 attributed arousal from an irrelevant source) can be considered adequately supported by the data. In contrast, empirical support for the first hypothesis (arousal reduction will lead to a proportional reduction in the intensity of emotional state) is weak at best, and the status of the third hypothesis (misattribution of emotionally induced arousal to a neutral source will result in a reduction of emotionality) is considered equivocal because of conflicting evidence and the existence of plausible alternative interpretations of the pertinent findings. 2. No compelling evidence has been found in support of some of Schachter's more 2 The validity of these attempts to account for the problematic findings mentioned above can only be determined by future research. Without independent supportive evidence, they cannot be considered persuasive. Ross and Olson (1981) have also advanced two arguments against the preparatory information hypothesis that in their opinion render this alternative explanation implausible. First, they suggest that if this latter interpretation were correct, then one should have observed a reduction of physiological arousal in the groups given correct symptom information. As judged from reports of experienced arousal symptoms, however, there was no such reduction of arousal in the studies reported above; in fact, some even found an increase in reported symptoms (e.g., Fries & Frey, 1980; Harris & Huang, 1974a, 1974b; Worchel & Yohai, 1979; Zanna & Cooper, 1974; Zanna, Higgins, & Taves, 1976). It is, however, not at all clear that the preparatory information hypothesis would predict a direct reduction of arousal (cf. Leventhal, 1980). In fact, this prediction is clear only as long as one operates within the framework of Schachter's theory; for if misattribution did not mediate the reduction of emotionality in these experiments, then the only other possibility left is that this effect was due to a reduction of arousal. Thus, if such arousal reductions do not occur, and if in addition the misattribution explanation were definitely shown to be wrong, one would have to conclude not only that the observed reduction of emotionality was not due to misattribution but also that it cannot be explained by Schachter's theory at all. Second, Ross and Olson suggest that the preparatory information hypothesis cannot explain the findings by Loftis and Ross (1974b). These latter authors found that subjects who had undergone a galvanic skin response conditioning procedure and were at the same time exposed to noise, but were told about arousing noise side-effects only afterwards, nevertheless showed accelerated extinction during the subsequent extinction trials. It could be argued, however, that subjects expected aftereffects of the noise to last throughout the extinction trials. In sum, Ross and Olson's (1981) arguments do not seem capable of invalidating the alternative explanation proposed by CalvertBoyanowsky et al. (1975). 258 RAINER REISENZEIN itely made by Schachter; nevertheless, it has been implicit in many of the misattribution studies). In some of these misattribution studies, however, more reliable effects were found on behavior than on subjective experience. This is perhaps most apparent in the aggression studies reviewed in the context of the excitation transfer paradigm, but similar results have also been obtained in other misattribution experiments (e.g., Calvert-Boyanowsky et al., 1975; Nisbett & Schachter, 1966; Younger & Doob, 1978). As pointed out by Bern (1972), Nisbett and Valins (1972), and Nisbett and Wilson (1977), such findings are paradoxical if it is assumed that the behavioral effects were mediated by subjective states. Throughout the review, the possibility has been stressed that these findings may largely be methodological artifacts due, for example, to inappropriate measurement points, insensitive measures of subjective experience, unwillingness on the part of subjects to admit their feelings, and so forth. There is much reason to suspect that such factors might indeed account for these paradoxical findings; therefore, it would be premature to dismiss the feeling-mediation hypothesis. On the other hand, these findings must not be taken too lightly, for should they be substantiated by future research, then existing notions concerning the mediation of the effects of arousal on emotion-related behavior would have to be substantially revised. In conclusion, it can be said that Schachter's theory has undoubtedly been of tremenIn sum, then, the available data seem to dous heuristic value as a generator of resupport only a rather attenuated version of search; the large number of studies reviewed Schachter's theory: that arousal feedback can above attests to this. It has also been imporhave an intensifying effect on emotional tant in focusing psychologists' attention on states, and that this arousal-emotion rela- the long-neglected cognitive component of tionship is mediated or modified in part by emotional states. Although there may be little causal attributions regarding the source of disagreement about the cognitive compoarousal. Even this weak version of the theory nent, it does seem that the role of peripheral is reasonably well supported only as regards arousal has been overstated and that the close the effects of extraneous arousal from an link between arousal and emotion proposed "irrelevant" source (cf. Hypothesis 2); con- by Schachter, and many others before him, cerning the more usual case of naturally oc- may be based less on empirical fact that on curring, emotionally induced arousal (cf. "symbolic relationships which are extrinsic Hypotheses 1 and 3), its status is much more from a scientific point of view" (Averill, 1974, ambiguous. p. 148). A final issue raised by this review of research concerns those Schachter-based modReference Note els that assume subjective feeling states to be mediators of overt behavior. (As mentioned 1. Roseman, I. Cognitive aspects of emotion and emobefore, this assumption has not been explictional behavior. Paper presented at the 87th Annual strongly formulated propositions. Specifically, (a) none of the studies reviewed above convincingly demonstrate that peripheral arousal is, indeed, a necessary condition for an emotional state, as claimed by Schachter. The frequently weak effects of arousal manipulations on the intensity of emotional states suggest, furthermore, that beyond the point of zero arousal, the link between arousal and emotion is much weaker than implied by Schachter's theory, (b) In cases where misattributed arousal from an extraneous source was found to intensify emotional reactions, no firm evidence supports the notion that this arousal was first perceived as unexplained and that this subsequently instigated an explanatory search process (see also, Nisbett & Wilson, 1977). Most probably, in these "successful" misattribution studies, the extra arousal stemming from a different source was not perceived as unexplained at all, but the total arousal experienced was attributed to the emotional sources by default. It is consistent with this speculation that those methodologically sound studies that seem to have come closest to creating a state of unexplained arousal (Marshall & Zimbardo, 1979; Maslach, 1979) did not find evidence for a misattribution effect. On the contrary, the results of these experiments suggest that if arousal is experienced as unexplained, this will effectively interfere with an attribution to a situationally suggested cause and tends to lead to a negatively toned affective state. THE SCHACHTER THEORY OF EMOTION Convention of the American Psychological Association, New York, September 1979. 259 Berkowitz, L., Lepinski, J., & Angulo, E. Awareness of own anger level and subsequent aggression. Journal of Personality and Social Psychology, 1969, 11, 2 9 3 300. References Berkowitz, L., & Turner, C. Perceived anger level, instigating Aiello, J. R., Epstein, Y. M., & Karlin, R. A. Effects of agent, and aggression. In H. London & R. E. Nisbett crowding on electrodermal activity. 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