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Functional specialization and generalization for grouping of stimuli based on colour and motion

Zeki, S; Stutters, J; (2013) Functional specialization and generalization for grouping of stimuli based on colour and motion. NeuroImage , 73 pp. 156-166. 10.1016/j.neuroimage.2013.02.001. Green open access

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Abstract

This study was undertaken to learn whether the principle of functional specialization that is evident at the level of the prestriate visual cortex extends to areas that are involved in grouping visual stimuli according to attribute, and specifically according to colour and motion. Subjects viewed, in an fMRI scanner, visual stimuli composed of moving dots, which could be either coloured or achromatic; in some stimuli the moving coloured dots were randomly distributed or moved in random directions; in others, some of the moving dots were grouped together according to colour or to direction of motion, with the number of groupings varying from 1 to 3. Increased activation was observed in area V4 in response to colour grouping and in V5 in response to motion grouping while both groupings led to activity in separate though contiguous compartments within the intraparietal cortex. The activity in all the above areas was parametrically related to the number of groupings, as was the prominent activity in Crus I of the cerebellum where the activity resulting from the two types of grouping overlapped. This suggests (a) that, the specialized visual areas of the prestriate cortex have functions beyond the processing of visual signals according to attribute, namely that of grouping signals according to colour (V4) or motion (V5); (b) that the functional separation evident in visual cortical areas devoted to motion and colour, respectively, is maintained at the level of parietal cortex, at least as far as grouping according to attribute is concerned; and (c) that, by contrast, this grouping-related functional segregation is not maintained at the level of the cerebellum.

Type: Article
Title: Functional specialization and generalization for grouping of stimuli based on colour and motion
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.neuroimage.2013.02.001
Publisher version: http://dx.doi.org/10.1016/j.neuroimage.2013.02.001
Language: English
Additional information: This is an article published under Creative Commons Attribution 3.0 Unported (CC BY 3.0) licence (https://creativecommons.org/licenses/by/3.0/)
Keywords: Science & Technology, Life Sciences & Biomedicine, Neurosciences, Neuroimaging, Radiology, Nuclear Medicine & Medical Imaging, Neurosciences & Neurology, Parietal cortex, V4, V5, Cerebellum, fMRI, Grouping, Functional specialization, POSTERIOR PARIETAL CORTEX, HUMAN VISUAL-CORTEX, HUMAN BRAIN, SYMBOLIC REPRESENTATIONS, EFFECTIVE CONNECTIVITY, HUMAN CEREBELLUM, WORKING-MEMORY, RHESUS-MONKEY, ATTENTION, AREAS
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology > Neuroinflammation
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences > Cell and Developmental Biology
URI: http://discovery.ucl.ac.uk/id/eprint/1386322
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