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Related Experiment Videos

Vertical-horizontal illusion: one eye is better than two

W Prinzmetal1, L Gettleman

  • 1Department of Psychology, University of California, Berkeley 94720.

Perception & Psychophysics
|January 1, 1993
PubMed
Summary
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The vertical-horizontal illusion, where vertical lines appear longer than equal horizontal lines, is reduced when viewed with one eye. This supports the idea that visual field asymmetry contributes to this common visual illusion.

Area of Science:

  • * Visual perception
  • * Psychophysics
  • * Cognitive psychology

Background:

  • * The vertical-horizontal illusion describes the tendency to perceive vertical lines as longer than horizontal lines of equal length.
  • * A prominent theory suggests this illusion arises from a horizontally elongated visual field, acting as a framing effect.
  • * This framing effect theory predicts a reduction in the illusion when using monocular (one-eyed) vision due to a less asymmetric visual field.

Purpose of the Study:

  • * To investigate whether monocular presentation reduces the vertical-horizontal illusion.
  • * To test the visual field asymmetry explanation of the vertical-horizontal illusion.
  • * To examine the illusion under various viewing conditions, including body orientation and lighting.

Main Methods:

Related Experiment Videos

  • * Five experiments were conducted to assess the vertical-horizontal illusion.
  • * Conditions included upright versus reclined viewing, monocular versus binocular presentation (dominant vs. non-dominant eye), and viewing in light versus dark.
  • * The influence of asymmetrical frames of reference was also evaluated.

Main Results:

  • * The vertical-horizontal illusion was consistently reduced when observers used monocular presentation.
  • * This reduction occurred under specific conditions that altered the asymmetry of the phenomenal visual field.
  • * Viewing conditions such as body posture and framing significantly impacted the illusion's magnitude.

Conclusions:

  • * Monocular viewing effectively reduces the vertical-horizontal illusion, supporting the visual field asymmetry theory.
  • * The findings indicate that the perceived asymmetry of the visual field plays a crucial role in this illusion.
  • * The study validates the framing effect hypothesis and its relation to visual field characteristics.