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Neuronal oscillations form parietal/frontal networks during contour integration
The ability to integrate visual features into a global coherent percept that can be further categorized and manipulated are fundamental abilities of the neural system. While the processing of visual information involves activation of early visual cortices, the recruitment of parietal and frontal cor...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Frontiers Media S.A.
2014
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4131516/ https://www.ncbi.nlm.nih.gov/pubmed/25165437 http://dx.doi.org/10.3389/fnint.2014.00064 |
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author | Castellano, Marta Plöchl, Michael Vicente, Raul Pipa, Gordon |
author_facet | Castellano, Marta Plöchl, Michael Vicente, Raul Pipa, Gordon |
author_sort | Castellano, Marta |
collection | PubMed |
description | The ability to integrate visual features into a global coherent percept that can be further categorized and manipulated are fundamental abilities of the neural system. While the processing of visual information involves activation of early visual cortices, the recruitment of parietal and frontal cortices has been shown to be crucial for perceptual processes. Yet is it not clear how both cortical and long-range oscillatory activity leads to the integration of visual features into a coherent percept. Here, we will investigate perceptual grouping through the analysis of a contour categorization task, where the local elements that form contour must be linked into a coherent structure, which is then further processed and manipulated to perform the categorization task. The contour formation in our visual stimulus is a dynamic process where, for the first time, visual perception of contours is disentangled from the onset of visual stimulation or from motor preparation, cognitive processes that until now have been behaviorally attached to perceptual processes. Our main finding is that, while local and long-range synchronization at several frequencies seem to be an ongoing phenomena, categorization of a contour could only be predicted through local oscillatory activity within parietal/frontal sources, which in turn, would synchronize at gamma (>30 Hz) frequency. Simultaneously, fronto-parietal beta (13–30 Hz) phase locking forms a network spanning across neural sources that are not category specific. Both long range networks, i.e., the gamma network that is category specific, and the beta network that is not category specific, are functionally distinct but spatially overlapping. Altogether, we show that a critical mechanism underlying contour categorization involves oscillatory activity within parietal/frontal cortices, as well as its synchronization across distal cortical sites. |
format | Online Article Text |
id | pubmed-4131516 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2014 |
publisher | Frontiers Media S.A. |
record_format | MEDLINE/PubMed |
spelling | pubmed-41315162014-08-27 Neuronal oscillations form parietal/frontal networks during contour integration Castellano, Marta Plöchl, Michael Vicente, Raul Pipa, Gordon Front Integr Neurosci Neuroscience The ability to integrate visual features into a global coherent percept that can be further categorized and manipulated are fundamental abilities of the neural system. While the processing of visual information involves activation of early visual cortices, the recruitment of parietal and frontal cortices has been shown to be crucial for perceptual processes. Yet is it not clear how both cortical and long-range oscillatory activity leads to the integration of visual features into a coherent percept. Here, we will investigate perceptual grouping through the analysis of a contour categorization task, where the local elements that form contour must be linked into a coherent structure, which is then further processed and manipulated to perform the categorization task. The contour formation in our visual stimulus is a dynamic process where, for the first time, visual perception of contours is disentangled from the onset of visual stimulation or from motor preparation, cognitive processes that until now have been behaviorally attached to perceptual processes. Our main finding is that, while local and long-range synchronization at several frequencies seem to be an ongoing phenomena, categorization of a contour could only be predicted through local oscillatory activity within parietal/frontal sources, which in turn, would synchronize at gamma (>30 Hz) frequency. Simultaneously, fronto-parietal beta (13–30 Hz) phase locking forms a network spanning across neural sources that are not category specific. Both long range networks, i.e., the gamma network that is category specific, and the beta network that is not category specific, are functionally distinct but spatially overlapping. Altogether, we show that a critical mechanism underlying contour categorization involves oscillatory activity within parietal/frontal cortices, as well as its synchronization across distal cortical sites. Frontiers Media S.A. 2014-08-13 /pmc/articles/PMC4131516/ /pubmed/25165437 http://dx.doi.org/10.3389/fnint.2014.00064 Text en Copyright © 2014 Castellano, Plöchl, Vicente and Pipa. http://creativecommons.org/licenses/by/3.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. |
spellingShingle | Neuroscience Castellano, Marta Plöchl, Michael Vicente, Raul Pipa, Gordon Neuronal oscillations form parietal/frontal networks during contour integration |
title | Neuronal oscillations form parietal/frontal networks during contour integration |
title_full | Neuronal oscillations form parietal/frontal networks during contour integration |
title_fullStr | Neuronal oscillations form parietal/frontal networks during contour integration |
title_full_unstemmed | Neuronal oscillations form parietal/frontal networks during contour integration |
title_short | Neuronal oscillations form parietal/frontal networks during contour integration |
title_sort | neuronal oscillations form parietal/frontal networks during contour integration |
topic | Neuroscience |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4131516/ https://www.ncbi.nlm.nih.gov/pubmed/25165437 http://dx.doi.org/10.3389/fnint.2014.00064 |
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