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Pupil size dynamics predict momentary changes in self-reported arousal
Ryan Y Yan 严严1, Tara Srirangarajan2, Jeremy N Bailenson3
1Department of Psychology, Stanford University, CA 94305, United States ryany98@stanford.edu.
Summary
Pupil size changes can track subjective arousal in real-time. This study shows pupil dynamics predict self-reported arousal with a 1.5-3.5 second lag, linking physiology to feelings.
Area of Science:
- Neuroscience
- Psychology
- Physiology
Background:
- Subjective arousal influences affect, behavior, and cognition.
- Self-report measures for arousal can alter the experience.
- Pupil size is a traditional but unclear index of arousal dynamics.
Purpose of the Study:
- To investigate the link between pupil dynamics and momentary subjective arousal.
- To establish pupil size as a precise marker for arousal fluctuations.
- To explore neural correlates of pupil dynamics and arousal.
Main Methods:
- Combined continuous pupillometry with repeated self-report arousal probes.
- Utilized a modified Monetary Incentive Delay task in VR and fMRI studies.
- Analyzed tonic and phasic pupil measures and associated neural activity.
Main Results:
- Tonic and phasic pupil measures predicted subsequent self-reported arousal (lag: 1.5-3.5s).
- Pupil dynamics predicted arousal beyond incentive value.
- Neural activity linked pupil dynamics, arousal, and motivation.
Conclusions:
- Pupil size serves as a temporally precise index of momentary arousal fluctuations.
- This finding bridges physiological measures with subjective affective experience.
- Neural activity driving pupil dynamics also predicts arousal and behavior.