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Quantification of Visual Feature Selectivity of the Optokinetic Reflex in Mice
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Pupil dynamics during bistable motion perception.

Jean-Michel Hupé1, Cédric Lamirel, Jean Lorenceau

  • 1Centre de Recherche Cerveau et Cognition, UPS, Université de Toulouse, Toulouse, France. Jean-Michel.Hupe@cerco.ups-tlse.fr

Journal of Vision
|September 19, 2009
PubMed
Summary
This summary is machine-generated.

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Pupil size changes reliably track perceptual shifts, but are mainly driven by motor responses, not cognitive states. Blink-related pupil constriction was also observed.

Area of Science:

  • Cognitive Neuroscience
  • Neurophysiology
  • Visual Perception

Background:

  • Pupil size fluctuates with illumination and cognitive factors.
  • It serves as a potential physiological marker for cortical states.
  • Understanding pupil dynamics offers insights into neural processing.

Purpose of the Study:

  • To investigate pupil dynamics during altered states of perception.
  • To differentiate between motor and perceptual components of pupil response.
  • To assess the pupil as a marker for cognitive states in visual processing.

Main Methods:

  • Recording pupil dynamics during continuous perceptual reports of ambiguous stimuli.
  • Utilizing button presses to mark perceptual transitions.
  • Analyzing pupil dilation and constriction in relation to motor and perceptual events.

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Main Results:

  • A small but significant pupil dilation (approx. 5%) was observed around perceptual shifts.
  • Motor responses accounted for approximately 70% of this pupil dilation.
  • A distinct pupil constriction followed blinks (approx. 8%).
  • Perceptual components of pupil modulation were independent of perceptual state duration.

Conclusions:

  • Pupil size changes are primarily linked to motor activity rather than endogenous perceptual bistability.
  • The pupil's constriction after blinks is a notable physiological response.
  • Monitoring pupil dynamics is valuable for visual processing research.