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Pupillometry to Assess Auditory Sensation in Guinea Pigs
09:25

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Published on: January 6, 2023

Bright illusions reduce the eye's pupil.

Bruno Laeng1, Tor Endestad

  • 1Department of Psychology, University of Oslo, 0317 Oslo, Norway. bruno.laeng@psykologi.uio.no

Proceedings of the National Academy of Sciences of the United States of America
|February 7, 2012
PubMed
Summary

Pupil size changes reflect perceived brightness, not just light energy. This suggests our visual system adapts to subjective visual experiences, shaping how we see light.

Area of Science:

  • Visual Perception
  • Neuroscience
  • Psychophysics

Background:

  • Pupil diameter is primarily influenced by ambient light levels.
  • Visual illusions can manipulate perceived brightness and lightness.
  • Understanding the relationship between physical light and subjective perception is crucial.

Purpose of the Study:

  • To investigate whether pupil diameter variations correlate with perceived brightness/lightness in visual illusions.
  • To determine if pupillary responses reflect subjective light perception over physical light energy.
  • To explore the role of visual experience in shaping neural circuitry.

Main Methods:

  • Infrared eye-tracking recorded pupil diameters during exposure to visual illusions.
  • Equiluminant stimuli controlled for physical light energy variations.

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  • Manipulated illusions to vary perceived luminance, with control conditions.
  • Second experiment used central eye fixation to rule out local contrast effects.

    • Main Results:

    • Pupil diameter significantly and rapidly varied with perceived brightness and lightness strength.
    • Pupillary responses were consistent across different illusion manipulations.
    • Eliminating local contrast differences did not alter pupillary responses.

    Conclusions:

    • Pupillary responses to light are modulated by subjective perception of brightness and lightness.
    • The physiological pupil response reflects subjective visual experience, not solely physical light.
    • This supports the theory that visual circuitry is shaped by experience with images and their sources.