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Related Experiment Videos

Pupil dilation in response preparation.

Sofie Moresi1, Jos J Adam, Jons Rijcken

  • 1Department of Movement Sciences, Maastricht University, PO Box 616 6200 MD Maastricht, Netherlands. sofie.moresi@bw.unimaas.nl

International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology
|December 11, 2007
PubMed
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Pupil size increases indicate greater cognitive load during response preparation. This study shows larger pupil dilations correlate with more complex task preparation, validating pupil size as a cognitive load measure.

Area of Science:

  • Cognitive Psychology
  • Neuroscience

Background:

  • Pupil size changes reflect cognitive processes.
  • The Grouping Model of finger preparation offers a framework for understanding response preparation.

Purpose of the Study:

  • To investigate pupillary changes during response preparation.
  • To test the hypothesis that more difficult response sets lead to increased pupillary dilation.

Main Methods:

  • A finger-cuing task was employed.
  • Pupil size was monitored during response preparation.

Main Results:

  • Pupillary dilation was significantly larger when preparing for more difficult response sets.
  • Results supported the hypothesis linking task difficulty to pupil response.

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Conclusions:

  • Pupil size is a valid indicator of cognitive load during response preparation.
  • Findings extend the utility of pupillometry in cognitive research.