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Linear tuning of gamma amplitude and frequency to luminance contrast: evidence from a continuous mapping paradigm

Perry, Gavin, Randle, James, Koelewijn, Loes, Routley, Bethany C. and Singh, Krish Devi 2015. Linear tuning of gamma amplitude and frequency to luminance contrast: evidence from a continuous mapping paradigm. PLoS ONE 10 (4) , e0124798. 10.1371/journal.pone.0124798

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Abstract

Individual differences in the visual gamma (30–100Hz) response and their potential as trait markers of underlying physiology (particularly related to GABAergic inhibition) have become a matter of increasing interest in recent years. There is growing evidence, however, that properties of the gamma response (e.g., its amplitude and frequency) are highly stimulus dependent, and that individual differences in the gamma response may reflect individual differences in the stimulus tuning functions of gamma oscillations. Here, we measured the tuning functions of gamma amplitude and frequency to luminance contrast in eighteen participants using MEG. We used a grating stimulus in which stimulus contrast was modulated continuously over time. We found that both gamma amplitude and frequency were linearly modulated by stimulus contrast, but that the gain of this modulation (as reflected in the linear gradient) varied across individuals. We additionally observed a stimulus-induced response in the beta frequency range (10–25Hz), but neither the amplitude nor the frequency of this response was consistently modulated by the stimulus over time. Importantly, we did not find a correlation between the gain of the gamma-band amplitude and frequency tuning functions across individuals, suggesting that these may be independent traits driven by distinct neurophysiological processes.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Psychology
Neuroscience and Mental Health Research Institute (NMHRI)
Subjects: B Philosophy. Psychology. Religion > BF Psychology
Publisher: Public Library of Science
ISSN: 1932-6203
Funders: MRC
Date of First Compliant Deposit: 30 March 2016
Date of Acceptance: 18 March 2015
Last Modified: 20 Mar 2019 23:11
URI: http://orca-mwe.cf.ac.uk/id/eprint/72901

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