Neuronal oscillations during contour integration of dynamic visual stimuli form parietal/frontal networks
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...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Frontiers Media S.A.
2014-08-01
|
| Series: | Frontiers in Integrative Neuroscience |
| Subjects: | |
| Online Access: | http://journal.frontiersin.org/Journal/10.3389/fnint.2014.00064/full |
| _version_ | 1818364430892662784 |
|---|---|
| author | Marta eCastellano Michael ePlöchl Raul eVicente Gordon ePipa |
| author_facet | Marta eCastellano Michael ePlöchl Raul eVicente Gordon ePipa |
| author_sort | Marta eCastellano |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-13T22:04:15Z |
| format | Article |
| id | doaj.art-87b3eeeb0c954f969a8e2ac2f3d9a52b |
| institution | Directory Open Access Journal |
| issn | 1662-5145 |
| language | English |
| last_indexed | 2024-12-13T22:04:15Z |
| publishDate | 2014-08-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Integrative Neuroscience |
| spelling | doaj.art-87b3eeeb0c954f969a8e2ac2f3d9a52b2022-12-21T23:29:55ZengFrontiers Media S.A.Frontiers in Integrative Neuroscience1662-51452014-08-01810.3389/fnint.2014.0006497376Neuronal oscillations during contour integration of dynamic visual stimuli form parietal/frontal networksMarta eCastellano0Michael ePlöchl1Raul eVicente2Gordon ePipa3Institute of Cognitive SciencesInstitute of Cognitive SciencesUniversity of Tartu, Faculty of Mathematics and Computer ScienceInstitute of Cognitive SciencesThe 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.http://journal.frontiersin.org/Journal/10.3389/fnint.2014.00064/fullVisual Perceptionoscillationsparietal cortexfeature bindingcontour integration |
| spellingShingle | Marta eCastellano Michael ePlöchl Raul eVicente Gordon ePipa Neuronal oscillations during contour integration of dynamic visual stimuli form parietal/frontal networks Frontiers in Integrative Neuroscience Visual Perception oscillations parietal cortex feature binding contour integration |
| title | Neuronal oscillations during contour integration of dynamic visual stimuli form parietal/frontal networks |
| title_full | Neuronal oscillations during contour integration of dynamic visual stimuli form parietal/frontal networks |
| title_fullStr | Neuronal oscillations during contour integration of dynamic visual stimuli form parietal/frontal networks |
| title_full_unstemmed | Neuronal oscillations during contour integration of dynamic visual stimuli form parietal/frontal networks |
| title_short | Neuronal oscillations during contour integration of dynamic visual stimuli form parietal/frontal networks |
| title_sort | neuronal oscillations during contour integration of dynamic visual stimuli form parietal frontal networks |
| topic | Visual Perception oscillations parietal cortex feature binding contour integration |
| url | http://journal.frontiersin.org/Journal/10.3389/fnint.2014.00064/full |
| work_keys_str_mv | AT martaecastellano neuronaloscillationsduringcontourintegrationofdynamicvisualstimuliformparietalfrontalnetworks AT michaeleplochl neuronaloscillationsduringcontourintegrationofdynamicvisualstimuliformparietalfrontalnetworks AT raulevicente neuronaloscillationsduringcontourintegrationofdynamicvisualstimuliformparietalfrontalnetworks AT gordonepipa neuronaloscillationsduringcontourintegrationofdynamicvisualstimuliformparietalfrontalnetworks |