Integration of motion responses underlying directional motion anisotropy in human early visual cortical areas.

Recent imaging studies have reported directional motion biases in human visual cortex when perceiving moving random dot patterns. It has been hypothesized that these biases occur as a result of the integration of motion detector activation along the path of motion in visual cortex. In this study we...

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Autores principales: Wouter Schellekens, Richard J A Van Wezel, Natalia Petridou, Nick F Ramsey, Mathijs Raemaekers
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Publicado: Public Library of Science (PLoS) 2013
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Acceso en línea:https://doaj.org/article/6ad0323c600040cfaea84352f4d092a8
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spelling oai:doaj.org-article:6ad0323c600040cfaea84352f4d092a82021-11-18T07:39:27ZIntegration of motion responses underlying directional motion anisotropy in human early visual cortical areas.1932-620310.1371/journal.pone.0067468https://doaj.org/article/6ad0323c600040cfaea84352f4d092a82013-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/23840711/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203Recent imaging studies have reported directional motion biases in human visual cortex when perceiving moving random dot patterns. It has been hypothesized that these biases occur as a result of the integration of motion detector activation along the path of motion in visual cortex. In this study we investigate the nature of such motion integration with functional MRI (fMRI) using different motion stimuli. Three types of moving random dot stimuli were presented, showing either coherent motion, motion with spatial decorrelations or motion with temporal decorrelations. The results from the coherent motion stimulus reproduced the centripetal and centrifugal directional motion biases in V1, V2 and V3 as previously reported. The temporally decorrelated motion stimulus resulted in both centripetal and centrifugal biases similar to coherent motion. In contrast, the spatially decorrelated motion stimulus resulted in small directional motion biases that were only present in parts of visual cortex coding for higher eccentricities of the visual field. In combination with previous results, these findings indicate that biased motion responses in early visual cortical areas most likely depend on the spatial integration of a simultaneously activated motion detector chain.Wouter SchellekensRichard J A Van WezelNatalia PetridouNick F RamseyMathijs RaemaekersPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 8, Iss 6, p e67468 (2013)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
Wouter Schellekens
Richard J A Van Wezel
Natalia Petridou
Nick F Ramsey
Mathijs Raemaekers
Integration of motion responses underlying directional motion anisotropy in human early visual cortical areas.
description Recent imaging studies have reported directional motion biases in human visual cortex when perceiving moving random dot patterns. It has been hypothesized that these biases occur as a result of the integration of motion detector activation along the path of motion in visual cortex. In this study we investigate the nature of such motion integration with functional MRI (fMRI) using different motion stimuli. Three types of moving random dot stimuli were presented, showing either coherent motion, motion with spatial decorrelations or motion with temporal decorrelations. The results from the coherent motion stimulus reproduced the centripetal and centrifugal directional motion biases in V1, V2 and V3 as previously reported. The temporally decorrelated motion stimulus resulted in both centripetal and centrifugal biases similar to coherent motion. In contrast, the spatially decorrelated motion stimulus resulted in small directional motion biases that were only present in parts of visual cortex coding for higher eccentricities of the visual field. In combination with previous results, these findings indicate that biased motion responses in early visual cortical areas most likely depend on the spatial integration of a simultaneously activated motion detector chain.
format article
author Wouter Schellekens
Richard J A Van Wezel
Natalia Petridou
Nick F Ramsey
Mathijs Raemaekers
author_facet Wouter Schellekens
Richard J A Van Wezel
Natalia Petridou
Nick F Ramsey
Mathijs Raemaekers
author_sort Wouter Schellekens
title Integration of motion responses underlying directional motion anisotropy in human early visual cortical areas.
title_short Integration of motion responses underlying directional motion anisotropy in human early visual cortical areas.
title_full Integration of motion responses underlying directional motion anisotropy in human early visual cortical areas.
title_fullStr Integration of motion responses underlying directional motion anisotropy in human early visual cortical areas.
title_full_unstemmed Integration of motion responses underlying directional motion anisotropy in human early visual cortical areas.
title_sort integration of motion responses underlying directional motion anisotropy in human early visual cortical areas.
publisher Public Library of Science (PLoS)
publishDate 2013
url https://doaj.org/article/6ad0323c600040cfaea84352f4d092a8
work_keys_str_mv AT wouterschellekens integrationofmotionresponsesunderlyingdirectionalmotionanisotropyinhumanearlyvisualcorticalareas
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AT nataliapetridou integrationofmotionresponsesunderlyingdirectionalmotionanisotropyinhumanearlyvisualcorticalareas
AT nickframsey integrationofmotionresponsesunderlyingdirectionalmotionanisotropyinhumanearlyvisualcorticalareas
AT mathijsraemaekers integrationofmotionresponsesunderlyingdirectionalmotionanisotropyinhumanearlyvisualcorticalareas
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