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Pre-stimulus alpha-band phase gates early visual cortex responses.

Wei Dou¹, Audrey Morrow¹, Luca Iemi²

¹Psychology Department, University of California, Santa Cruz, CA 95064, USA.

|March 14, 2022

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The phase of alpha oscillations (8-13 Hz) influences visual perception by gating sensory input flow from the thalamus to the visual cortex (V1). This suggests an early mechanism in visual processing.

Area of Science:

Neuroscience
Visual Perception
Human Electrophysiology

Background:

Alpha-band oscillations (8-13 Hz) are known to inhibit perceptual reports.
The precise physiological mechanism, feedforward or feedback, remains debated.
Limited human neurophysiological data exists to support proposed models.

Purpose of the Study:

To investigate the link between pre-stimulus alpha phase and early visual evoked potentials.
To determine the origin and mechanism of alpha-band's influence on visual processing.

Main Methods:

Utilized electroencephalography (EEG) to record brain activity in human observers.
Employed specialized visual stimuli to elicit C1 event-related potentials (ERPs) indicative of striate cortex activity.
Analyzed single-trial associations between pre-stimulus alpha phase and post-stimulus C1 global field power (GFP).

Keywords:

Alpha oscillation C1 component Phase Thalamus V1

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Main Results:

Significant correlations were found between pre-stimulus alpha phase and C1 GFP amplitude.
GFP amplitude decreased as pre-stimulus alpha phase deviated from an optimal phase.
Control analyses confirmed the findings were not due to post-stimulus artifacts.

Conclusions:

Pre-stimulus alpha phase modulates early visual processing, specifically afferent input to human V1.
Findings support an early gating mechanism for visual information flow between the thalamus and V1.
The results suggest a feedforward role for alpha oscillations in visual gating, though other models remain plausible.