Large Visual Stimuli Induce Two Distinct Gamma Oscillations in Primate Visual Cortex

Murty, Dinavahi V P S and Shirhatti, Vinay and Ravishankar, Poojya and Ray, Supratim (2018) Large Visual Stimuli Induce Two Distinct Gamma Oscillations in Primate Visual Cortex. In: JOURNAL OF NEUROSCIENCE, 38 (11). pp. 2730-2744.

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Abstract

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.

Item Type:	Journal Article
Publication:	JOURNAL OF NEUROSCIENCE
Publisher:	SOC NEUROSCIENCE, 11 DUPONT CIRCLE, NW, STE 500, WASHINGTON, DC 20036 USA
Additional Information:	Copy right for the article belong to SOC NEUROSCIENCE, 11 DUPONT CIRCLE, NW, STE 500, WASHINGTON, DC 20036 USA
Department/Centre:	Division of Biological Sciences > Centre for Neuroscience Division of Physical & Mathematical Sciences > Mathematics
Date Deposited:	12 Apr 2018 18:49
Last Modified:	12 Apr 2018 18:49
URI:	http://eprints.iisc.ac.in/id/eprint/59521

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