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Related Experiment Videos

Neural adaptation of imaginary visual motion

D Gilden1, R Blake, G Hurst

  • 1Department of Psychology, University of Texas at Austin, 78712.

Cognitive Psychology
|February 1, 1995
PubMed
Summary

Visual adaptation to motion influences imagined object speed. Real motion adaptation slows imagined speed in the same direction and speeds it up in the opposite direction, suggesting shared neural pathways.

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Area of Science:

  • * Visual perception and cognitive neuroscience.
  • * Exploration of visual motion processing and mental imagery.

Background:

  • * Previous research indicates visual adaptation affects motion perception.
  • * The relationship between real motion perception and imagined motion is not fully understood.

Purpose of the Study:

  • * To investigate how adaptation to real visual motion influences judgments of imagined motion speed.
  • * To explore the neural mechanisms underlying imagined motion and their relation to real vision.

Main Methods:

  • * Participants judged the time-to-contact of an imagined moving object.
  • * The visual field was previously adapted to a specific direction of real motion.
  • * The direction of imagined motion was varied relative to the adapting motion direction.

Main Results:

  • * Imagined motion speed was reduced when in the same direction as adaptation.
  • * Imagined motion speed was increased when in the opposite direction of adaptation.
  • * Orthogonal motion directions showed no effect on imagined speed.

Conclusions:

  • * Prior motion adaptation influences imagined motion speed, suggesting common neural mechanisms.
  • * Despite shared mechanisms, imagined and real motion perception are not functionally identical.
  • * Negative aftereffects in imagined motion suggest movement is inferred from static image changes.

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