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Related Experiment Video

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The Perceived Size and Shape of Objects in Peripheral Vision.

Joseph Baldwin1, Alistair Burleigh1, Robert Pepperell1

  • 1School of Art & Design, Cardiff Metropolitan University, Cardiff, UK.

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|October 5, 2016
PubMed
Summary

Objects in peripheral vision appear smaller and distorted, especially with longer exposure. This study confirms size diminution is a feature of visual space, with shape distortions occurring mainly in the far periphery.

Keywords:
artperipheral visionshape perceptionsize perceptionvisual space

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Area of Science:

  • Visual perception
  • Neuroscience
  • Psychophysics

Background:

  • Perception of size and shape in far peripheral vision is poorly understood.
  • Artistic observations suggest peripheral objects appear smaller and compressed.
  • This study investigates visual perception in the periphery.

Purpose of the Study:

  • To experimentally test if objects appear smaller and distorted in peripheral vision.
  • To quantify size perception differences between central and peripheral vision.
  • To assess shape discrimination accuracy in the visual periphery.

Main Methods:

  • Experiment 1: Participants drew peripheral discs to assess perceived size and shape.
  • Experiment 2: Method of constant stimuli compared peripheral and central stimulus sizes.
  • Experiment 3: Assessed shape discrimination accuracy for peripheral stimuli.

Main Results:

  • Peripheral discs were perceived as significantly smaller than central discs.
  • Shape distortions (elliptical, polygonal contours) were reported with longer exposures.
  • Shape discrimination was accurate except in the far periphery.

Conclusions:

  • Objects in the visual periphery are perceived as diminished in size across both brief and long exposures.
  • Size diminution appears to be an intrinsic characteristic of visual space.
  • Shape distortions are primarily associated with longer exposure durations in the periphery.