doublPERRY ET AL SUMMARY
Psychology Being Investigated
Interpersonal Distance – This refers to the physical space between people
during interactions. It’s a crucial aspect of social behaviour, signalling comfort
and responsiveness. People typically have an implicit sense of comfortable
interpersonal distance, and variations in this distance can affect social
interactions significantly.
Role of Oxytocin (OT) in Social Interactions – Oxytocin is a hormone that
plays a significant role in social behaviours. The study explores how OT might
alter the perceptual salience of social cues (how this social hormone might affect
how people perceive social cues) in impacting how individuals process these
cues based on their empathic abilities.
Empathy and Social Behaviour – Empathy, the ability to understand and share
the feelings of others, is crucial in shaping social behaviour. The study examines
how varying levels of empathy might influence individuals’ responses to social
cues, particularly in the context of interpersonal distance.
Background
Interpersonal Distance in Social Interactions – Prior studies highlighted that
interpersonal distance — the space between people — plays a crucial role in
shaping the dynamics of social interactions. This distance serves as an important
cue signalling comfort and responsiveness in social settings. It’s an implicit yet
clearly felt aspect, particularly noticeable when someone stands closer or farther
away than culturally or socially expected.
Oxytocin’s Role in Social Behaviour – There has been increasing evidence
suggesting that OT functions as a social hormone in humans. One of its
significant roles appears to be altering the perceptual salience of social cues,
which includes cues related to interpersonal distance. This finding implies that OT
can influence how individuals perceive and respond to social interactions and
cues.
Empathic Ability and Social Stimuli Processing – Prior research also
suggested that an individual’s ability to empathize — to understand and share the
feelings of others — might shape how they process social stimuli. This includes
how individuals perceive and react to interpersonal distance in social interactions.
It was theorised that OT could have varying effects on preferred interpersonal
distances, depending on individual differences in empathy levels
Aims
The study aimed to examine :
how OT administration influences interpersonal distance preferences in
individuals with varying levels of empathy.
It hypothesised that OT would decrease preferred interpersonal distances among
highly empathic individuals but increase them for less empathic ones.
Procedure and Methodology
Participants –
54 male undergraduate students aged 19-32 participated, divided into high and
low empathy groups based on the Interpersonal Reactivity Index (IRI)
scores.
Design –
The study used a double-blind, placebo-controlled design.
Participants attended two sessions a week apart, receiving either OT or a
placebo.
Variables
1st IV – whether P received nasal drops of oxytocin or a placebo (saline solution)
Ps took part in both conditions therefore this part of the experiment was a
repeated measures. (randomised order)
2nd IV – level of empathy of the P (high or low empathy based on the IRI score)
This part of the experiment was independent measures, cos the P can only be
either high or low in empathy.
Method –
After administering OT/placebo, participants completed the IRI questionnaire.
Two experiments followed.
First Experiment (Comfortable Interpersonal Distance Paradigm) –
In this experiment, known as the Comfortable Interpersonal Distance (CID)
paradigm, participants interacted with a computer-visualised protagonist.
The protagonist would approach the participant in a computer-simulated room.
Participants were instructed to indicate when they wanted the protagonist to stop,
choosing a distance at which they felt most comfortable.
This experiment has been previously validated and tested across different sex
and age groups and with various types of protagonists. In this study, it was a
stranger, an authority figure, and a friend.
This part then was a repeated measures – all Ps indicated their preferences of
where they want the person to stop in terms of interpersonal distance in ALL
conditions (DV)
Second Experiment (Intimacy Context) –
This experiment focused on interpersonal distance preferences in the context
of intimacy.
Participants were asked to choose from several computer-visualised rooms
where they would prefer to sit and discuss intimate topics with another
participant.
The two different dependent variables here – the mean average preferred
distance & mean average preferred angle between different items of furniture in a
room.
This was an original paradigm, previously tested in the lab, and shown to
significantly predict Comfortable Interpersonal Distance scores.
Both experiments were designed to investigate how OT administration would
affect interpersonal distance preferences among participants with varying levels
of empathy.
The hypothesis was that OT would promote closeness among highly empathic
participants but might have an opposite effect on those with low empathic traits.
Results
Experiment 1 (CID) –
Oxytocin decreased preferred mean distance from a protagonist in the high
empathy group & decreased it in the low empathy group (Difference was very low
though)
In the high empathy group, placebo condition, there were significant differences
between the preferred distances between the preferred distances for friend &
authority, as well as friend & stranger, as expected.
BUT, not with the ball & all other conditions. When OT was given, Ps were more
willing to be closer to the ball than the stranger or authority figure. (ball could be
perceived as an invitation to social interaction, a cue for the high empathisers)
Experiment 2 (Intimacy Context) –
The high empathisers chose closer chair distances in the OT condition compared
to the placebo condition, while the opposite effect was found for the low
empathisers in the OT condition.
But the effect was only approaching significance for the high empathisers.
However, OT did not have an effect on preferred chair angle for either the high or
low empathisers.
Overall Findings
These results indicate that the effect of OT on social cognition and behavior
varies based on individual differences, such as empathy levels.
The findings support the social salience hypothesis and highlight the nuanced
role of OT in influencing social interactions.
Social Salience Hypothesis in this case is about the social effects of OT, which says that OT
increases one’s attention to social cues, affecting how a person may process the cues and
respond in different ways, depending on the situation.
Conclusions
The study concluded that Oxytocin (OT), a hormone, affects how close we want
to be to other people, and this effect changes depending on how empathetic we
are.
If someone is very empathetic, OT makes them comfortable with being closer to
others. But if someone is not very empathetic, OT might make them want to keep
more distance.
Therefore, OT doesn’t just make everyone friendlier or want to be closer; its
effect varies from person to person based on their empathy levels.
Strengths
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High internal validity –
The double-blind, placebo-controlled design is the gold standard for
clinical research. In this study, neither the participants nor the
experimenters knew whether OT or a placebo was administered, which
significantly reduced biases. This approach ensured that the effects
observed could be more confidently attributed to OT, rather than the
expectations or preconceptions of the participants or researchers.
Control of extraneous variables –
The use of a computerised version of the CID task and a carefully
designed room choice experiment provided precise and objective
measures of interpersonal distance preferences. By standardizing the
experimental conditions and ensuring that all participants were
exposed to the same stimuli in a controlled environment, the study
minimised external variables that could otherwise confound the results.
This methodological precision enhances the credibility of the findings.
Reliability –
The study’s design, which included two different but thematically
related experiments (CID and Choosing Rooms), provided an
opportunity to test the consistency of findings across different
methodologies. The replication of similar results across these two
distinct experimental setups significantly enhances the reliability of the
findings. In research, the ability to replicate results under different
conditions is a key indicator of their reliability.
Weaknesses
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Marginal significance of results –
The study found that the interaction between treatment (OT
administration) and empathy was only marginally significant in the CID
experiment (P = 0.09). This marginal significance indicates that the
effects, while present, are not robustly(strongly) demonstrated. In
scientific research, especially in psychology, stronger statistical
significance is generally sought to confidently assert findings.
(Since the study was conducted in 2015, societal norms and behaviors related to
personal space may have evolved. Question now is if the study is done again
today, might more robust findings be found? This question then behooves the
replication of the study in more contemporary times.)
[the point above is raised to lengthen the discussion to allow the para to be
longer for balance]
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Limited generalisability –
The study included only male participants, significantly limiting its
generalisability. The hormonal, psychological, and social dynamics can
differ markedly between genders. Consequently, the study’s findings
cannot be extrapolated to females, who may respond differently to OT
in terms of interpersonal distance preferences.
(we can probably talk about cultural differences here because ‘personal
space’ can be seen very differently in different cultures, and perhaps
we can also raise the issue of social status of people, because
personal space can be assessed differently too, depending on the kind
of social status we come from)
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Reduced ecological validity –
The use of computerised experiments, while advantageous for
standardisation and control of experimental conditions, may reduce
ecological validity. The simulated nature of the tasks might not
accurately capture the nuances of real-life social interactions where
interpersonal distances are negotiated.