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Phase specific shape aftereffects explained by the tilt aftereffect.

Vanessa K Bowden¹, J Edwin Dickinson¹, Robert J Green¹

¹School of Psychological Science, University of Western Australia.

Journal of Experimental Psychology. Human Perception and Performance

|April 26, 2019

Summary

This summary is machine-generated.

Repulsive aftereffects in human visual perception, like the tilt aftereffect, can explain shape perception. This suggests a general mechanism for distinguishing stimuli, potentially altering previous research conclusions.

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Area of Science:

Cognitive Psychology
Neuroscience
Human Visual Perception

Background:

Adaptation aftereffects are crucial for understanding human visual perception.
Typically, aftereffects cause stimuli to be perceived as repelled from adaptor properties, e.g., the tilt aftereffect.

Purpose of the Study:

To investigate the mechanisms underlying shape aftereffects in human visual perception.
To determine if local tilt aftereffects can account for adaptation in radial frequency patterns.

Main Methods:

Examined aftereffects of adaptation to radial frequency patterns.
Applied principles of local tilt aftereffects to the contours of shape stimuli.

Main Results:

Shape aftereffects, sensitive to pattern amplitude and orientation, can be explained by local tilt aftereffects along the shape contour.
Demonstrated a repulsive effect in shape perception.

Conclusions:

Local tilt aftereffects may provide a general mechanism for enhancing perceptual discrimination between successive stimuli.
Findings suggest a need to reconsider conclusions from studies assuming shape-specific adaptation mechanisms.