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Related Experiment Video

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Observational Fear as a Model of Affective Empathy in Mice

Observational Fear as a Model of Affective Empathy in Mice

Published on: November 22, 2024

Pupillary contagion: central mechanisms engaged in sadness processing.

Neil A Harrison¹, Tania Singer, Pia Rotshtein

¹Wellcome Department of Imaging Neuroscience, Institute of Neurology and Institute of Cognitive Neuroscience, University College London, UK. n.harrison@fil.ion.ucl.ac.uk

Social Cognitive and Affective Neuroscience

|December 23, 2006

Summary

Observed pupil size influences emotional perception. Smaller pupils intensify sadness ratings, engaging social cognition brain regions and mirroring in observers, indicating autonomic empathy.

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Area of Science:

Neuroscience
Social Psychology
Cognitive Science

Background:

Empathic responses are crucial for social interaction and emotional understanding.
Pupil size is an involuntary physiological signal that can convey information about arousal and attention.

Purpose of the Study:

To investigate how observed pupil size affects the perception of emotional facial expressions.
To examine the neural mechanisms underlying the influence of pupil size on emotional perception and empathy.

Main Methods:

Participants rated the emotional intensity and valence of facial expressions with varying pupil sizes.
Functional magnetic resonance imaging (fMRI) was used to measure brain activity during the task.
Observers' own pupil size changes were recorded to assess physiological mirroring.

Main Results:

Diminishing pupil size significantly enhanced ratings of emotional intensity and valence for sad facial expressions, but not for happy, angry, or neutral expressions.
Observed pupil size changes were mirrored by participants' own pupil size, indicating empathetic contagion.
This empathetic contagion engaged the brainstem pupillary control nuclei (Edinger-Westphal nucleus) and modulated activity in social cognition networks.

Conclusions:

Observed pupil size acts as a non-verbal cue that modulates the perception of emotional expressions, particularly sadness.
Physiological mirroring of pupil size reflects an autonomic empathy mechanism.
These findings suggest that perception-action mechanisms extend to non-volitional autonomic nervous system responses, deepening our understanding of social cognition.