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Related Experiment Videos

Latency correction explains the classical geometrical illusions.

Mark A Changizi1, David M Widders

  • 1Department of Psychological and Brain Sciences, Duke University, Durham, NC 27708-0086, USA. changizi@changizi.com

Perception
|November 15, 2002
PubMed
Summary

The visual system corrects for neural latency by perceiving the present, explaining geometrical illusions. This

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Area of Science:

  • Visual perception
  • Neuroscience
  • Psychophysics

Background:

  • There is a significant neural delay between light hitting the retina and conscious visual perception.
  • The brain must compensate for this visual processing latency.

Purpose of the Study:

  • To test the 'perceiving the present' hypothesis for visual illusions.
  • To explain classical geometrical illusions using a predictive visual model.

Main Methods:

  • Analysis of geometrical illusions through the lens of the 'perceiving the present' hypothesis.
  • Psychophysical experiments designed to test predictions of the hypothesis.

Main Results:

  • The 'perceiving the present' hypothesis successfully explains several geometrical illusions (Hering, Orbison, Müller-Lyer, Double Judd, Poggendorff, Corner, Upside-down-T).
  • Stimuli are perceived as they would appear in the immediate future, assuming observer motion.
  • Experimental results confirm the hypothesis's predictions.

Conclusions:

  • The visual system actively constructs a present percept by predicting future sensory input.
  • This predictive mechanism accounts for distortions in visual perception, manifesting as geometrical illusions.

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