Perry, Gavin ORCID: https://orcid.org/0000-0003-0468-0421, Randle, James, Koelewijn, Loes ORCID: https://orcid.org/0000-0002-7890-171X, Routley, Bethany C. and Singh, Krish Devi ORCID: https://orcid.org/0000-0002-3094-2475 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 |
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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: | 19 May 2023 20:09 |
URI: | https://orca.cardiff.ac.uk/id/eprint/72901 |
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