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Activity in early visual areas predicts interindividual differences in binocular rivalry dynamics.

Hiroyuki Yamashiro¹, Hiroki Yamamoto, Hiroaki Mano

¹Graduate School of Human and Environmental Studies, Kyoto University, Kyoto, Japan;

Journal of Neurophysiology

|December 20, 2013

Summary

Binocular rivalry (BR) involves alternating perceptions between two images. This study reveals that early visual areas, specifically V3 and V4v, influence BR dynamics by showing weaker neural responses correlate with longer suppression periods.

Keywords:

binocular rivalry dynamics continuous flash suppression early visual areas fMRI functional magnetic resonance imaging individual differences

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Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition

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Published on: July 21, 2020

Area of Science:

Neuroscience
Visual Perception
Cognitive Science

Background:

Binocular rivalry (BR) causes spontaneous perceptual alternations between dissimilar images shown to each eye.
Neural correlates of BR dynamics are known in higher visual areas, but the role of early visual cortex remains unclear.
Previous studies overlooked early visual areas due to their response to physical stimulus changes, not just perceptual alternations.

Purpose of the Study:

To investigate the contribution of early visual areas to the dynamics of binocular rivalry (BR).
To explore the link between brain activity in early visual areas during suppression periods and BR dynamics.
To determine if activity in human early visual areas predicts perceptual alternations in BR.

Main Methods:

Utilized continuous flash suppression (CFS), a strong interocular suppression paradigm.
Measured retinotopic responses to an invisible probe stimulus using functional MRI.
Analyzed brain activity during suppression periods, not just perceptual switches.

Main Results:

Individual differences in suppression durations during CFS varied significantly across subjects.
Amplitudes of retinotopic activity in extrastriate visual areas (V3 and V4v) predicted suppression durations.
Weaker neural responses in V3 and V4v were associated with longer suppression durations.

Conclusions:

Retinotopic representations in early visual areas (V3 and V4v) play a role in the dynamics of perceptual alternations during binocular rivalry.
Activity levels in early visual cortex during suppression periods are linked to the duration of perceptual suppression.
This finding highlights a previously overlooked contribution of early visual processing to complex perceptual phenomena like BR.