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A Method to Study Adaptation to Left-Right Reversed Audition

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Facilitation beyond suppression: Enhanced direction discrimination after bidirectional motion adaptation.

Sabrina Karjack¹, Alexander Yu¹, Zili Liu¹

¹University of California Los Angeles (UCLA), United States of America.

Vision Research

|August 7, 2025

Summary

Motion adaptation studies reveal that adapting to one direction (unidirectional) impairs direction discrimination. However, adapting to opposing directions (bidirectional) enhances motion discrimination sensitivity and accuracy.

Keywords:

Bidirectional Direction discrimination Discrimination sensitivity Motion adaptation

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Area of Science:

Visual neuroscience
Perception psychology

Background:

Motion adaptation is a well-studied phenomenon in visual neuroscience.
Traditional models suggest adaptation leads to direction-specific suppression.

Purpose of the Study:

To investigate the effects of unidirectional and bidirectional motion adaptation on direction discrimination.
To challenge existing models of motion adaptation.

Main Methods:

Participants adapted to clockwise, counterclockwise, or bidirectional rotating stimuli.
Direction discrimination sensitivity was measured using a rotational motion paradigm.

Main Results:

Unidirectional adaptation decreased sensitivity and induced directional bias.
Bidirectional adaptation enhanced direction discrimination sensitivity without bias.

Conclusions:

Findings challenge direction-specific suppression models of motion adaptation.
Support a dynamic, resource-based account of visual system recalibration.