Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Chapter 6: Memory Processes Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Memory Processes Encoding Storage Retrieval Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Encoding Processes • Creating an acoustic code – What it sounds like • Creating a semantic code – What it means • Creating a visual code – What it looks like Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Encoding Types and STM • Type of code may rely on type of task • STM refers to memory that is held temporarily • Evidence exists for a variety of encoding types in STM Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Evidence for Acoustic Encoding in STM • Conrad (1964) – Visually present a series of letters briefly – Immediately write the letters viewed once series is complete (Try it - Starts on next click) Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Conrad (1964) • You Viewed B C F M N P N S T V • What errors did you make? – F for S – B for V – P for B • Not visual errors (e.g., E for F, O for Q, R for P) • Thus, items acoustically even though stimuli were presented visually Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Shulman (1970) • Evidence for semantic encoding in STM • Participants viewed 10-word lists • Given a recognition test using visually represented "probe words" which were either: – Homonyms - e.g. "bawl" for "ball" – Synonyms - e.g. "talk" for "speak" or – Identical to the original word Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Shulman (1970) Results • The Homonym and Synonym probes produced similar error rates - suggesting that an equal amount of acoustic and semantic processing must be taking place – Homonyms - e.g. "bawl" for "ball" – Synonyms - e.g. "talk" for "speak" – Identical to the original word Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Posner & Keele (1967) • Evidence for visual encoding in STM – Letter matching task – Two letters separated by brief interval – Participant had to indicate if same letter • A-a Yes • A-A Yes • A-M No – Measure reaction time Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Posner & Keele (1967) Results • If letters were the same visually (a-a) • participants were faster than if the letters were not the same visually (A-a) Results indicate that visual code was also present for STM Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Encoding Types & LTM • Type of code may rely on type of task • LTM refers to memory that may be held permanently • Evidence exists for a variety of encoding types for LTM Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Semantic Encoding in LTM • Grossman & Eagle (1970) – Study 41 different words – Given recognition test after delay – 9 of the distractors were semantically related to words on list – 9 of the distractors were not – False alarms for each type: 1.83 of synonyms, but only 1.05 of unrelated Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Visual Encoding in LTM • Frost (1972) – Participants studied 16 drawings – Manipulated visual orientation and semantic category – After a delay, participants were asked if they had studied an object with the same name as the test object – Reaction time was measured – Participants responded faster to identical drawings than drawings in a different orientation – This result indicates visual encoding occurred Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Acoustic Encoding in LTM • Evidence of very long-term memory for songs • Rubin (1977) • Participants recall more of the text when provided with the melody of a well-learned song ("Star Spangled Banner") than when given no cue Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Transfer from STM to LTM • Consolidation – Integrating new information into stored information • Disruption of consolidation is studied in amnesiacs – ECT patients (Squire) Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Metamemory • Knowing what you know • Knowing how your memory works • Being able to assess your own memory • Young children lack metamemory skills Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Principles to Strengthen Memory • Elaborative rehearsal is better than maintenance rehearsal • Distributed practice is better than massed practice – “Spacing effect” • Organizing information enhances memory Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 What causes the spacing effect? • Multiple encoding contexts theory – Multiple study sessions lead to multiple types of encoding, thus more possibility of matching during test conditions • REM Theory – The more REM sessions following study sessions, the more consolidation that occurs Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Mnemonic Devices to Aid Memory • Categorical clustering • Interactive images • Pegword system • Method of loci • Acronyms • Acrostics • Keyword system Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Which Mnemonic is the Best? •Roediger (1980) [Insert Table 6.2] Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Prospective Memory • The ability to remember a future intention – Buying bread on your way home from work – Going to the dentist on Wednesday • Retrospective memory is memory of the past Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Retrieval Processes • Getting information back out • Multiple processes can be used to enhance • • retrieval Different strategies are used for short term storage and long term storage Matching the type of processes done during encoding with the type of processes done at retrieval increases success Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Retrieval from STM • Is the search serial or parallel? – Serial indicates one by one search – Parallel means all items are processed at once • Is the search exhaustive or self-terminating? – Exhaustive indicates that all items in the set are examined – Self-terminating means that after target is found the search stops Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Studying Searching in STM • Saul Sternberg (1967) • Memorize a set of numbers (6,3,8,2,7) • Shown a probe digit • Participant must • indicate if the probe was in the set Time to respond is measured 2 6,5,8,2,7 Yes Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Sternberg (1967) • 3 critical factors manipulated – How many items were in the set the participants had to memorize – Whether the probe was in the list – The probe’s location in the set Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Sternberg (1967) •Possible Result Patterns – A represents parallel processing – B illustrates serial processing – C illustrates exhaustive serial processing – D illustrates selfterminating serial processing Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Sternberg’s Conclusion • A serial exhaustive model • But…. – Corcoran (1971) proposed that a parallel model could also explain the pattern found – Townsend (1971) stated it was mathematically impossible to distinguish parallel from serial – Thus, both models still exist Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Retrieval from LTM • The types of cues you use to retrieve may affect what you can retrieve… – Free recall vs Categorized recall – Study random list or an organized list • What is the impact on memory? Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Bower, Clark, Lesgold, and Winzenz (1969) Randomized list Naples World Italy Americas Montreal Bristol Washington Ottowa Orlando England Europe Dallas Liverpool Winnipeg Rome USA London Florence Canada Organized list World Europe Americas England Italy USA Canada London Rome Washington Ottowa Liverpool Florence Dallas Montreal Bristol Naples Orlando Winnipeg Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Bower & Associates (1969) • Participants remembered 65% of the organized list, only 19% of the random list • Thus, Organization helps memory retrieval Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Chechile (2004) • Manipulated time to retrieve and probablility of retrieval – Little time, fewer words recalled – More time, more words recalled Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 If You Cannot Retrieve from LTM… • Has the memory disappeared? • Is the memory available but not accessible? Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Evidence Supporting “Still There” Theory Nelson (1971) Paired associate List 43-house 67-dog 38-dress 77-sissors Cued recall test 43- ________ 67- ________ Two week delay Subjects recalled 75% of items on list But focus was on 25% they forgot. Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Nelson (1971) Critical Manipulation If participants forgot “38-dress” and “77-sissors” then participants relearned either same pairs or changed pairs Same Changed 25% “forgotten” Relearned 38-dress 38-dress 77-sissors 77-sissors 38-dress 77-sissors 38-apple 77-kettle Results 78% 43% The better performance of participants in the same condition indicate that there was some memory left for “forgotten” items. Otherwise both groups would remember the same amount. Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Theories about Forgetting • Decay theory – Memory is weakened with disuse – Simply passage of time… • Interference theory – Proactive: old memories interfere with recall of new information – Retroactive: new memories interfere with recall of old information Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Interference versus Decay in STM • Brown-Peterson Paradigm – Participants were given 3 consonants to try to remember (e.g., FRL) – Participants were then given a 3 digit number (294) & asked to count backwards by threes (e.g., 291, 288, 285) – After varying delays (3-18 seconds) participants were asked to recall the 3 letters Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Brown-Peterson results (1959) Trigrams were forgotten by 18 seconds due to retroactive interference of counting backwards Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Proactive Interference in STM •Keppel & Underwood (1962) – Replicated the Peterson & Peterson Task varying the time delay to recall – Analysis was done by trial number (1st trial, 2nd trial, 3rd trial, etc.) – Found support for proactive interference Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Retroactive Interference from LTM Experimental group Learn List A Learn List B Delay Test for Memory A Control group ------------ Learn List A Delay Test for Memory A The experimental group will remember less material from the tested list A compared to the control group Information learned afterwards interferes with retrieval of List A. Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Proactive Interference from LTM Experimental group Learn List A Learn List B Delay Test for Memory B Control group No study Learn List B Delay Test for Memory B The experimental group remembers less material from the tested list B than the control group Information previously learned (list A) interferes with retrieval of List B Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Let’s Test Your LTM! • You will see several words, one at a time • Do whatever you can to try and remember as many of the words as you can • At the end of the list, try to recall as many words as you can Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 BED Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 CLOCK Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 DREAM Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 NIGHT Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 TURN Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 MATTRESS Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 SNOOZE Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 NOD Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 TIRED Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 NIGHT Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 ARTICHOKE Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 INSOMNIA Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 REST Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 TOSS Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 NIGHT Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 ALARM Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 NAP Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 SNORE Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 PILLOW Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Write down the words you saw Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Here are the words in the order viewed BED ARTICHOKE CLOCK INSOMNIA DREAM REST NIGHT TOSS TURN NIGHT MATTRESS ALARM NAP SNOOZE SNORE NOD PILLOW TIRED NIGHT Did you recall? Bed? Clock? Snore? Pillow? Night? Artichoke? Toss? Toss & Turn? Sleep? Explanation Primacy Effect Recency Effect Spacing Effect Distinctiveness Clustering False Memory Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Serial Position Curve Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Autobiographical Memory • Memory of personal history • Constructive in nature Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Constructive Nature of LTM • Bartlett (1932) was the first to demonstrate distortions for prose – Read stories about Native Americans – Subjects were good at recalling “gist” information – Omission of detail was systematic • Tended to omit information that did not make sense to the participants Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Constructive Nature of LTM • Prior experience influences how we recall information • Having retrieval cues can help us recall more information, but cues can also lead to errors Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Owens, Bower and Black (1979) Nancy arrived at the cocktail party. She looked around the room to see who was there. She went to talk with her professor. She felt she had to talk to him but was a little nervous about just what to say. A group of people started to play charades. Nancy went over and had some refreshments. The hors d’oevres were good but she was interested in talking to the rest of the people at the party. After a while, she decided she’d had enough and left the party. Some participants also heard that passage, but w/ this theme: Nancy woke up feeling sick and she wondered if she really were pregnant. How could she tell the professor she had been seeing? And the money was another problem. Participants were then asked to recall as much about the story as they could Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Owens, Bower and Black (1979) Results Studied Propositions Inferred Propositions Theme 29.2 No Theme 20.3 15.2 3.7 The “theme” offered some background information and some retrieval cues, which increased recall. However, the background info also led to more intrusions (memory for information not present), such as “The professor got Nancy pregnant.” Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Memory Distortion • Simply recalling may distort your memory • Simple suggestion may distort your memory • Memory is constructive in nature Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Schacter’s “Seven Sins of Memory” 1. Memories are transient (fade with time) 2. We do not remember what we do not pay attention to 3. Our memories can be temporarily blocked 4. We can misattribute the source of memory 5. We are suggestible in our memories 6. We can show memory distortion (bias) 7. We often fail to forget the things we would like not to recall (persistence of memory) Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Eyewitness memory • The single greatest cause of wrongful convictions nationwide, playing a role in more than 75% of convictions overturned through DNA testing. • http://www.innocenceproject.org/ Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Loftus & Palmer (1974) • Participants were all shown the same video of an accident between two cars • Some subjects asked: “How fast were the cars going when they smashed into each other?” • Others were asked: “How fast were the cars going when they hit each other?” Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Loftus & Palmer (1974) “How fast were the cars going when they ________ into each other?” Word Used Average Speed Estimated Smashed Collided Bumped Hit Contacted 41 m.p.h. 39 m.p.h. 38 m.p.h. 34 m.p.h. 32 m.p.h. Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Problems with Lineups • Assumption that perpetrator is in lineup • Distractor selection is also important • Police behavior may also influence Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Children’s Eyewitness Memory • Be wary of repeated questioning • Leading questions may distort memory • Younger children are more suggestible Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 False Memories / Memory Illusions • Roediger & McDermott (1995) – Present a list of associated words, missing one “target” word (e.g., tired, bed, night, dream, etc., but not SLEEP) – With immediate recall, participants tend to recall the non-presented target item – More importantly, when asked whether they “remember” or “know” the word was on the list, they report an actual memory for the item Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 False Memory cont’d • Garry, Manning, Loftus & Sherman (1996) – Participants complete Life Events Inventory (LEI) – Then are led through imagination exercises – Fill out LEI again • The results show that when participants imagine events that they said did not happen to them, they are more likely to say they did happen to them Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Repressed or Recovered Memories of Abuse • A person remembers now that 20 years ago, • • • someone sexually abused them Traumatic memory was previously repressed, but was recovered (often) under hypnosis in therapy Validity of recovered memories? Empirical evidence for Freudian repression? Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Can Painful Abuse Memories be Repressed? • Skeptics argue that repression (or in some cases dissociation) of sexual memories is a concept without any scientific merit • If repression does not exist, there can be no such thing as a recovered repressed memory; rather, a recovered memory of abuse can only be a false memory of abuse Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 False Memory vs. Repressed Memory Issue • Evidence for suggested false memory is not automatically evidence against repressed-recovered memories, and vise versa Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 No Consensus on the Issue • Results vary dependent upon characteristics sample (volunteers, children, child services, adult recall, etc.) – Some abuse memories are not traumatic, and thus are presumably not repressed, rather they may be forgotten, like any memory • Post-traumatic stress syndrome may also occur – One symptom is recurrent, intrusive thoughts about the traumatic incident—this is the opposite of repression • Some may handle memory of sexual abuse by blocking out of mind either by repression or dissociation Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Flashbulb Memories • Some researchers propose that events that are particularly surprising or arousing will yield flashbulb memories • Where were you when the… – Challenger explosion occurred? – OJ verdict was read? – JFK was assassinated? – Bombing of the twin towers? Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Flashbulb Memories • Some research proposes good memory for – Place where you learned of information – What you were doing when you heard it – Where you heard the information from – Emotions in self and others – The aftermath Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Emotion and Memory • There is a strong relationship (.90) between the emotionality and vividness of memory – This does not mean that the memory is accurate • Emotional events seem to be less resistant to forgetting over time… – Perhaps they are perceived better – Perhaps we think about them more Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Flashbulb Memory Results Neisser and Harsch (1992) – Tested immediate memory for Shuttle Explosion, and then tested it again 3 years later – There was little agreement with the two “memories” despite the confidence of the participants Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Encoding Specificity • Memory is improved when information available at encoding is also available at retrieval Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Amabile & Rovee-Collier (1991) • The match between encoding and test for babies is very important • 3 & 6 month old infants were taught in crib with a particular bumper background to kick to move the mobile Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Amabile & Rovee-Collier (1991) • Infants kicked more strongly in the same context • However, you can teach infants in multiple contexts to weaken the encoding specificity Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Encoding Specificity Tulving & Thompson (1973) 1st Study list: Learn target words in capital letters Cue Target head LIGHT grasp BABY 2nd Free association: Generate 6 words for each word presented Word Possible Generations dark light, black, room…. infant sleeping, bottle, baby…. Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 3rd Recognition Test: Circle any generated words that were in the study list in capital letters Word dark infant Possible Generations light, black, room…. sleeping, bottle, baby…. 4th Recall: Recall the words from the study list in capital letters, using these cues that they were studied with Word Possible Generations grasp ________ head ________ Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Tulving & Thompson (1973) Results Percentage of words Recalled / Recognized 100 They recalled more than they recognized! 50 0 Free Association Recognition test Study List Recall test Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Encoding Specificity • Tulving (1983) – People encode the context with the target material • Physical match (class, diving, smell) • Emotional match (happy, depressed) • Understanding match (childhood amnesia, under the influence of drugs match) Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Memory Development--Kail • Asked participants aged 6 to 21 to do mental addition to a memory search • Found age-related increases in the amount of information that could be held in memory • Is it the capacity that increases or the ability to use the capacity? Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Kail & Hall (1999) • 12 boys and 12 girls at ages 8, 9, 10, 11, and • 12 years Given simple addition and subtraction word problems – “Nancy has 6 marbles. Eve has 3 marbles. How many marbles does Nancy need to give away to have as many as Eve?” Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Results • Both domain-specific and general information-processing skills contribute to children's success on word problems • Thus, older children holding larger and more complex bits of information Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Metamemory Knowledge in Children • Young children – Underuse strategies – Have little connection between memory awareness and memory strategies – Less likely to spontaneously use memory strategies Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Appel, Cooper, McCarrell, SimsKnight, Yussen & Flavell (1972) • Preschoolers (4 yrs old), First Graders (7 yrs old) • • • and fifth graders (11 yrs old) Given either a “Look” or a “Remember” task 9-15 Pictures of vehicles, clothes, food were displayed Children were observed to see if they showed any behaviors indicating a memory strategy during the “look and memory” task Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Appel et al. Results • If told to “look”, no one used a memory strategy • If told to “remember”, older children used a strategy to help, preschoolers did not • Older children remembered more Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Cognitive Monitoring • What you know and what you do not know – Flavell, Friedrichs & Hoyt (1970) – Preschool and elementary children asked to study a set of items until they were sure they could recall them perfectly… – When tested, elementary children could recall pretty well, the preschool children could not. Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 6 Memory in Adulthood • Cohen (1992) – Older university students received better coursework grades than younger students – However, if timed recall was required, they did less well. – Most age decline can be compensated for by expertise