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Related Experiment Videos

The line-motion illusion: attention or impletion?

P E Downing1, A M Treisman

  • 1Department of Psychology, Princeton University, New Jersey 08544, USA. pdowning@princeton.edu

Journal of Experimental Psychology. Human Perception and Performance
|June 1, 1997
PubMed
Summary

Visual attention creates an illusion of motion in a line after a cue. This study suggests the illusion arises from the brain filling in motion, not attention gradients.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Visual Perception

Background:

  • A visual illusion causes perceived motion in a horizontal line after a lateral cue.
  • This phenomenon was previously attributed to visual attention gradients.

Purpose of the Study:

  • To investigate the underlying mechanism of the perceived motion illusion in a horizontal line.
  • To challenge the visual attention gradient theory and propose an alternative explanation.

Main Methods:

  • Presenting observers with a brief lateral cue followed by an instantaneously presented horizontal line.
  • Analyzing observer reports of perceived motion within the line.

Main Results:

  • The illusion of motion propagating from the cued to the uncued end was consistently reported.
  • Findings support an impletion process rather than attention gradients as the cause.

Conclusions:

  • The perceived motion illusion is better explained by an impletion process.
  • This process involves the brain interpolating motion between successive states of an object.

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