On interocular transfer of motion aftereffects

Area of Science:

• Visual Neuroscience
• Perception
• Motion Perception

Background:

• The motion aftereffect (MAE) is a visual illusion where prolonged viewing of motion in one direction leads to the perception of motion in the opposite direction upon cessation of the stimulus.
• Recent studies suggest MAE arises from adapting detectors sensitive to relative, rather than purely retinal, motion.
• Interocular transfer (IOT) of the MAE, where adaptation in one eye influences perception in the other, provides insights into binocular processing.

Purpose of the Study:

• To quantitatively assess the interocular transfer (IOT) of the motion aftereffect (MAE).
• To investigate the role of relative motion detectors in MAE.
• To examine the dichoptic interactions underlying MAE.

Main Methods:

• Experiments involved presenting moving gratings to one or both eyes to induce MAE.
• IOT of MAE was measured by adapting one eye and testing with the other, or using dichoptic configurations.
• Adaptation and testing conditions varied central and flanking grating presentations across eyes.

Main Results:

• The MAE showed approximately 30% interocular transfer when the fellow eye was dark or presented a stationary grating.
• Dichoptic presentation of stimuli revealed complex interactions, with MAEs largely confined to conditions matching adaptation.
• Surround MAEs and MAEs tested binocularly after alternating monocular adaptation showed similar durations, suggesting robust underlying mechanisms.

Conclusions:

• The MAE is primarily a consequence of adapting relative-motion detectors.
• These relative-motion detectors can be either monocular or binocular (OR class).
• Findings support a model where MAE processing involves both specific monocular pathways and binocular interactions.