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High-gamma oscillations precede visual steady-state responses: A human electrocorticography study.

Benjamin Wittevrongel¹, Elvira Khachatryan¹, Evelien Carrette²

¹Laboratory for Neuro- and Psychophysiology, KU Leuven, Leuven, Belgium.

Human Brain Mapping

|September 5, 2020

Summary

High-gamma oscillations precede steady-state visual responses, offering new insights into visual cortex mechanisms and potential links to neurological conditions.

Keywords:

SSVEP cross-frequency coupling (CFC)electrocorticography (ECoG)frequency tagging phase locking phase-amplitude coupling (PAC)photic driving

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Area of Science:

Neuroscience
Visual Cortex Research
Neural Oscillations

Background:

Steady-state cortical activation from flickering visual stimuli is widely used in research.
This paradigm maps cortical characteristics and their relation to pathologies.
However, the precise neural mechanisms remain unclear.

Observation:

High-gamma (55-125 Hz) oscillations synchronize with flickering visual stimuli.
These high-gamma oscillations precede the fundamental neural response.
Subdural recordings show correlated latencies between high-gamma and fundamental responses, with a ~55ms delay in the latter.

Findings:

Single-trial latency variability in the fundamental response is mirrored in high-gamma latency.
This suggests top-down feedback projections influence the fundamental response.
High-gamma oscillations are synchronized to the visual stimulus frequency.

Implications:

Alterations in steady-state responses may stem from changes in visual gamma activity or feedback mechanisms.
Further research can differentiate the roles of gamma responses and feedback in visual processing.
This study enhances understanding of visual cortex function and its relation to disease.