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Increasing pupil size is associated with improved detection performance in the periphery.

Lisa Valentina Eberhardt1, Christoph Strauch2, Tim Samuel Hartmann3

  • 1General Psychology, Faculty of Engineering, Computer Science and Psychology, Ulm University, Albert-Einstein-Allee 47, 89069, Ulm, Germany. lisa.eberhardt@uni-ulm.de.

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Pupil size influences vision. Larger pupils enhance peripheral vision detection of faint stimuli, with changes in pupil size also impacting visual performance.

Keywords:
Detection performancePeripheral visionPupil sizePupillometry

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Area of Science:

  • Visual neuroscience
  • Perception psychology

Background:

  • The pupil regulates light entry, affecting visual input.
  • Pupil size influences visual resolution and signal-to-noise ratio.

Purpose of the Study:

  • To investigate the impact of pupil size on visual detection performance.
  • To explore the role of pupillary changes in modulating visual functions.

Main Methods:

  • Experiment 1: Online study assessing pupil size effects on visual discrimination.
  • Experiment 2: Laboratory study using eye tracking to measure pupil size and performance.

Main Results:

  • Large pupil size improves peripheral detection of faint stimuli.
  • Both current and preceding pupil size, and their interaction, predict performance.
  • Pupillary change extent modulates perceptual functions.

Conclusions:

  • Pupil size and its dynamic changes are crucial for visual processing.
  • Findings suggest both sensory and arousal-driven mechanisms underlie these effects.