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Errors in interception can be predicted from errors in perception.

Cristina de la Malla1, Jeroen B J Smeets1, Eli Brenner1

  • 1Department of Human Movement Sciences, Vrije Universiteit Amsterdam, The Netherlands.

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|April 30, 2017
PubMed
Summary
This summary is machine-generated.

Actions are not less susceptible to visual illusions than perception. Our study shows actions rely on perceptual judgments, challenging the two visual streams hypothesis for visual illusions.

Keywords:
ActionIllusionsInterceptionPerceptionVisual pathways

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • The two visual streams hypothesis suggests separate brain pathways for perception and action.
  • It is hypothesized that actions are less affected by visual illusions than perceptual judgments.

Purpose of the Study:

  • To test whether actions are less susceptible to visual illusions than perceptual judgments.
  • To investigate the relationship between visual illusions, perception, and action control.

Main Methods:

  • Subjects intercepted a Gabor patch, a visual stimulus designed to create illusions of speed.
  • Perceptual judgments of position and velocity were recorded using forced-choice discrimination tasks.
  • Action errors during interception were predicted based on perceptual judgments and sensorimotor delay.

Main Results:

  • Predicted action errors closely matched the actual errors made by subjects during target interception.
  • The visual illusion significantly influenced both perceptual judgments and subsequent actions.

Conclusions:

  • The findings do not support the two visual streams hypothesis regarding visual illusions.
  • The degree to which an action is influenced by an illusion reflects its reliance on that specific perception.