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Movement Retraining using Real-time Feedback of Performance
08:16

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Published on: January 17, 2013

Predicting the motion after-effect from sensitivity loss.

M Morgan1, C Chubb, J A Solomon

  • 1Henry Wellcome Vision Research Laboratories, City University, London EC1V 0HB, UK. M.Morgan@city.ac.uk

Vision Research
|March 15, 2006
PubMed
Summary
This summary is machine-generated.

Directional adaptation alters visual perception, shifting the balance point of opponent mechanisms. This study found that adaptation decreases sensitivity in directionally tuned mechanisms, supporting the disinhibition theory of the motion after-effect (MAE).

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Area of Science:

  • Visual neuroscience
  • Perception psychology

Background:

  • The disinhibition theory explains the motion after-effect (MAE) by proposed changes in opponent mechanism balance due to directional adaptation.
  • Understanding how contrast adaptation influences this balance point is crucial for validating MAE theories.

Purpose of the Study:

  • To investigate if post-adaptation balance points can be predicted from contrast adaptation.
  • To examine the effects of directional adaptation on threshold-vs-contrast (T-vs-C) functions.
  • To test the predictions of the disinhibition theory regarding MAE mechanisms.

Main Methods:

  • Measured threshold-vs-contrast (T-vs-C) functions before and after adaptation to moving gratings.
  • Analyzed shifts in the point of maximum facilitation (the dip) for same and opposite direction tests.
  • Derived transducer functions to predict MAE strength.

Main Results:

  • Adaptation shifted the T-vs-C dip upwards and rightwards for same-direction tests, and similarly but less for opposite-direction tests.
  • These shifts align with changes in divisive gain control or subtractive inhibition with half-wave rectification.
  • A slight under-prediction of contrast for perceived balance suggests potential sensory recalibration.

Conclusions:

  • The study supports the disinhibition theory, indicating MAE is primarily caused by decreased sensitivity in directionally tuned mechanisms.
  • Adaptation did not impair the detection or direction identification of low-contrast stimuli.
  • Findings provide insights into the neural mechanisms underlying motion perception and aftereffects.