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Testing Visual Sensitivity to the Speed and Direction of Motion in Lizards
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The direction after-effect is a global motion phenomenon.

William Curran1, Lee Beattie1, Delfina Bilello1

  • 1School of Psychology, Queen's University Belfast, David Keir Building, 18-30 Malone Road, Belfast BT9 5BN, UK.

Royal Society Open Science
|April 30, 2019
PubMed
Summary
This summary is machine-generated.

The direction after-effect (DAE) arises from global motion processing, not local. This visual perception phenomenon is linked to neural mechanisms in areas MT and MST.

Keywords:
adaptationdirection after-effectmotion processingvisual perception

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Computational Neuroscience

Background:

  • Prior visual experience shapes perception, exemplified by the direction after-effect (DAE).
  • The precise cortical location of DAE neural mechanisms remains debated, distinguishing between early local and later global motion processing.
  • Unikinetic plaids, combining static and drifting gratings, present a unique stimulus for investigating motion perception.

Purpose of the Study:

  • To determine the neural locus of the direction after-effect (DAE).
  • To differentiate between local and global motion processing contributions to the DAE.
  • To investigate the role of cortical areas MT and MST in visual aftereffects.

Main Methods:

  • Utilized a unikinetic plaid as an adapting stimulus.
  • Measured the direction after-effect (DAE) using a drifting random dot test stimulus.
  • Assessed the DAE in response to varying local and pattern motion directions of the adapting plaid.

Main Results:

  • The direction after-effect (DAE) was induced by the pattern motion of the unikinetic plaid.
  • The DAE was not induced by the component motion of the plaid.
  • These findings implicate global motion processing in the neural mechanisms underlying the DAE.

Conclusions:

  • The neural mechanisms responsible for the direction after-effect (DAE) are located at the global motion processing level.
  • Evidence suggests these mechanisms are no earlier than cortical area MT.
  • This study clarifies the cortical processing stages involved in visual aftereffects.