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Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns

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Published on: May 12, 2019

Periodic perturbations producing phase-locked fluctuations in visual perception.

Min-Suk Kang¹, David Heeger, Randolph Blake

¹Department of Psychology and Vanderbilt Vision Research Center, Vanderbilt University, Nashville, TN 37240, USA. m.suk.kang@gmail.com

Journal of Vision

|March 11, 2009

Summary

Periodic perturbation reveals traveling waves in perception. This novel technique tracks how visibility changes, showing that perceptual organization relies on spatio-temporal context.

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Area of Science:

Psychophysics
Neuroscience
Visual Perception

Background:

Binocular rivalry involves alternating visibility of competing stimuli.
Understanding perceptual dynamics is key to visual processing.

Purpose of the Study:

Introduce periodic perturbation for studying perceptual waves.
Characterize traveling waves during binocular rivalry and fusion.
Investigate the relationship between spontaneous alternations and wave dynamics.

Main Methods:

Developed a periodic perturbation technique with contrast triggers.
Monitored rivalry in a central region while presenting triggers in antiphase.
Measured latency between triggers and perceptual state switches.
Compared results with discrete trial techniques.

Main Results:

Periodic perturbation successfully entrained rivalry alternations.
Latency increased with trigger distance, indicating traveling waves.
Traveling waves showed similar characteristics to those from discrete trials.
Discovered a novel relation between spontaneous alternation dynamics and wave speed.
Observed traveling waves even without binocular rivalry, suggesting general spatio-temporal dependence.

Conclusions:

Periodic perturbation is an effective method for studying perceptual waves.
Evidence supports the existence of traveling waves of dominance in visual perception.
Perceptual organization is influenced by spatio-temporal context beyond binocular rivalry.