Journal
JOURNAL OF NEUROSCIENCE
Volume 38, Issue 11, Pages 2730-2744Publisher
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.2270-17.2017
Keywords
area V1; EEG; gamma; LFP; oscillation; rhythm
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Funding
- DBT-Wellcome Trust India Alliance [500145-Z-09-Z] Funding Source: Medline
- Wellcome Trust Funding Source: Medline
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Recent studies have shown the existence of two gamma rhythms in the hippocampus subserving different functions but, to date, primate studies in primary visual cortex have reported a single gamma rhythm. Here, we show that large visual stimuli induce a slow gamma (25-45 Hz) in area V1 of two awake adult female bonnet monkeys and in the EEG of 15 human subjects (7 males and 8 females), in addition to the traditionally known fast gamma (45-70 Hz). The two rhythms had different tuning characteristics for stimulus orientation, contrast, drift speed, and size. Further, fast gamma had short latency, strongly entrained spikes and was coherent over short distances, reflecting short-range processing, whereas slow gamma appeared to reflect long-range processing. Together, two gamma rhythms can potentially provide better coding or communication mechanisms and a more comprehensive biomarker for diagnosis of mental disorders.
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