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Related Experiment Videos

Pupil dilation patterns spontaneously synchronize across individuals during shared attention.

Olivia Kang1, Thalia Wheatley2

  • 1Department of Psychology.

Journal of Experimental Psychology. General
|April 7, 2017
PubMed
Summary

Pupil dilation patterns reveal how minds connect during conversations. Pupillary synchrony, a measure of shared attention, increases during emotional moments, showing real-time mental coupling.

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Area of Science:

  • Cognitive Neuroscience
  • Social Psychology
  • Psychophysiology

Background:

  • Human social interaction depends on the ability to synchronize mental states.
  • Understanding the neural and physiological underpinnings of shared attention is crucial for social cognition research.

Purpose of the Study:

  • To investigate whether pupil dilations can serve as a real-time indicator of mental coupling between speakers and listeners.
  • To explore the relationship between pupillary synchrony, emotional salience, and individual differences in empathy and expressivity.

Main Methods:

  • Eye-tracking was used to record pupil dilations of speakers discussing autobiographical memories and listeners watching these videos.
  • Morphological similarity of speaker-listener pupillary time-series data was calculated as a metric for shared attention.

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  • Independent raters dynamically assessed the emotional salience of the narratives.

    • Main Results:

    • Pupillary synchrony between speakers and listeners was significantly higher during emotionally salient parts of the narratives.
    • Synchrony decreased as the narratives became less engaging.
    • The highest levels of pupillary synchrony were observed in dyads characterized by high speaker expressivity and high listener empathy.

    Conclusions:

    • Pupillary synchrony serves as an implicit physiological marker of shared attention and mental coupling.
    • This finding offers a novel, real-time method for quantifying inter-person synchrony in social interactions.
    • The results highlight the role of emotional engagement and individual differences in facilitating mental coupling.