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Motivated action: Pupil diameter during active coping.

Christopher T Sege1, Margaret M Bradley1, Peter J Lang1

  • 1University of Florida, Center for the Study of Emotion and Attention, 3063 Longleaf Road, Gainesville, FL, 32608, United States.

Biological Psychology
|April 13, 2020
PubMed
Summary
This summary is machine-generated.

Pupil diameter increases when individuals prepare to control or escape aversive stimuli, reflecting action preparation. Trait anxiety levels did not alter this pupil response during coping behaviors.

Keywords:
AnxietyEmotionMotor ActivityPupil

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Area of Science:

  • Psychology
  • Neuroscience
  • Cognitive Science

Background:

  • Pupil diameter is a sensitive indicator of cognitive and emotional states.
  • Locus of control influences how individuals engage with and process aversive stimuli.
  • Understanding pupil modulation during aversive processing can reveal insights into action preparation.

Purpose of the Study:

  • To investigate how pupil diameter changes with locus of control during aversive processing.
  • To examine if trait anxiety modulates pupil responses related to coping strategies (escape and avoidance).

Main Methods:

  • Participants with varying anxiety levels were exposed to cues signaling controllable (escape/avoidance) or uncontrollable aversive events.
  • Pupil diameter was continuously measured during the cue-to-event interval.
  • Behavioral responses (button presses) were recorded to confirm control actions.

Main Results:

  • Pupil diameter was significantly larger when participants prepared for escape or avoidance compared to uncontrollable exposure.
  • This increase in pupil diameter during preparation for coping was observed across all anxiety levels.
  • Results suggest pupil dilation reflects action preparation, irrespective of trait anxiety.

Conclusions:

  • Pupil diameter serves as a physiological marker for action preparation in the context of aversive stimuli.
  • Trait anxiety does not appear to modulate the pupil's role in action preparation during coping behaviors in healthy individuals.