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Gamma Frequency and the Spatial Tuning of Primary Visual Cortex

Visual stimulation produces oscillatory gamma responses in human primary visual cortex (V1) that also relate to visual perception. We have shown previously that peak gamma frequency positively correlates with central V1 cortical surface area. We hypothesized that people with larger V1 would have sma...

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Detalles Bibliográficos
Autores principales: Gregory, Sarah, Fusca, Marco, Rees, Geraint, Schwarzkopf, D. Samuel, Barnes, Gareth
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4928794/
https://www.ncbi.nlm.nih.gov/pubmed/27362265
http://dx.doi.org/10.1371/journal.pone.0157374
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author Gregory, Sarah
Fusca, Marco
Rees, Geraint
Schwarzkopf, D. Samuel
Barnes, Gareth
author_facet Gregory, Sarah
Fusca, Marco
Rees, Geraint
Schwarzkopf, D. Samuel
Barnes, Gareth
author_sort Gregory, Sarah
collection PubMed
description Visual stimulation produces oscillatory gamma responses in human primary visual cortex (V1) that also relate to visual perception. We have shown previously that peak gamma frequency positively correlates with central V1 cortical surface area. We hypothesized that people with larger V1 would have smaller receptive fields and that receptive field size, not V1 area, might explain this relationship. Here we set out to test this hypothesis directly by investigating the relationship between fMRI estimated population receptive field (pRF) size and gamma frequency in V1. We stimulated both the near-center and periphery of the visual field using both large and small stimuli in each location and replicated our previous finding of a positive correlation between V1 surface area and peak gamma frequency. Counter to our expectation, we found that between participants V1 size (and not PRF size) accounted for most of the variability in gamma frequency. Within-participants we found that gamma frequency increased, rather than decreased, with stimulus eccentricity directly contradicting our initial hypothesis.
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spelling pubmed-49287942016-07-18 Gamma Frequency and the Spatial Tuning of Primary Visual Cortex Gregory, Sarah Fusca, Marco Rees, Geraint Schwarzkopf, D. Samuel Barnes, Gareth PLoS One Research Article Visual stimulation produces oscillatory gamma responses in human primary visual cortex (V1) that also relate to visual perception. We have shown previously that peak gamma frequency positively correlates with central V1 cortical surface area. We hypothesized that people with larger V1 would have smaller receptive fields and that receptive field size, not V1 area, might explain this relationship. Here we set out to test this hypothesis directly by investigating the relationship between fMRI estimated population receptive field (pRF) size and gamma frequency in V1. We stimulated both the near-center and periphery of the visual field using both large and small stimuli in each location and replicated our previous finding of a positive correlation between V1 surface area and peak gamma frequency. Counter to our expectation, we found that between participants V1 size (and not PRF size) accounted for most of the variability in gamma frequency. Within-participants we found that gamma frequency increased, rather than decreased, with stimulus eccentricity directly contradicting our initial hypothesis. Public Library of Science 2016-06-30 /pmc/articles/PMC4928794/ /pubmed/27362265 http://dx.doi.org/10.1371/journal.pone.0157374 Text en © 2016 Gregory et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Gregory, Sarah
Fusca, Marco
Rees, Geraint
Schwarzkopf, D. Samuel
Barnes, Gareth
Gamma Frequency and the Spatial Tuning of Primary Visual Cortex
title Gamma Frequency and the Spatial Tuning of Primary Visual Cortex
title_full Gamma Frequency and the Spatial Tuning of Primary Visual Cortex
title_fullStr Gamma Frequency and the Spatial Tuning of Primary Visual Cortex
title_full_unstemmed Gamma Frequency and the Spatial Tuning of Primary Visual Cortex
title_short Gamma Frequency and the Spatial Tuning of Primary Visual Cortex
title_sort gamma frequency and the spatial tuning of primary visual cortex
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4928794/
https://www.ncbi.nlm.nih.gov/pubmed/27362265
http://dx.doi.org/10.1371/journal.pone.0157374
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