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Gamma oscillations in primate primary visual cortex are severely attenuated by small stimulus discontinuities

Shirhatti, V and Ravishankar, P and Ray, S (2022) Gamma oscillations in primate primary visual cortex are severely attenuated by small stimulus discontinuities. In: PLoS biology, 20 (6). e3001666.

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Official URL: https://doi.org/10.1371/journal.pbio.3001666


Gamma oscillations (30 to 80 Hz) have been hypothesized to play an important role in feature binding, based on the observation that continuous long bars induce stronger gamma in the visual cortex than bars with a small gap. Recently, many studies have shown that natural images, which have discontinuities in several low-level features, do not induce strong gamma oscillations, questioning their role in feature binding. However, the effect of different discontinuities on gamma has not been well studied. To address this, we recorded spikes and local field potential from 2 monkeys while they were shown gratings with discontinuities in 4 attributes: space, orientation, phase, or contrast. We found that while these discontinuities only had a modest effect on spiking activity, gamma power drastically reduced in all cases, suggesting that gamma could be a resonant phenomenon. An excitatory-inhibitory population model with stimulus-tuned recurrent inputs showed such resonant properties. Therefore, gamma could be a signature of excitation-inhibition balance, which gets disrupted due to discontinuities.

Item Type: Journal Article
Publication: PLoS biology
Publisher: NLM (Medline)
Additional Information: The copyright for this article belongs to the Authors.
Keywords: action potential; animal; gamma rhythm; photostimulation; physiology; primate; striate cortex; visual cortex, Action Potentials; Animals; Gamma Rhythm; Photic Stimulation; Primary Visual Cortex; Primates; Visual Cortex
Department/Centre: Division of Biological Sciences > Centre for Neuroscience
Division of Physical & Mathematical Sciences > Mathematics
Date Deposited: 16 Sep 2022 08:32
Last Modified: 16 Sep 2022 08:32
URI: https://eprints.iisc.ac.in/id/eprint/76540

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