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Representation of the ipsilateral visual field in the transition zone between areas 17 and 18 of the cat's cerebral cortex

Published online by Cambridge University Press:  02 June 2009

B. R. Payne
B. R. Payne
Affiliation:
Department of Anatomy, Housman Research Center, Boston University School of αMedicine, Boston
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Abstract

The representation of the visual field in the architectonically defined transition zone between areas 17 and 18 of cat cerebral cortex was assessed by recording the activities and plotting the receptive fields of neurons at 2327 sites along 148 electrode penetrations made in 19 cats. The results show that the transition zone contains a significant representation of the ipsilateral visual hemifield although not all elevations in the visual field represented to the same extent. The shape of the field region represented resembles an hour glass, for the region represented is narrowest on the 0-deg horizontal meridian and increasingly wider at progressively more positive and negative elevations. When receptive-field centers are considered, the extent of the representation reaches to -2.5 deg on the 0-deg horizontal meridian and to 10 or more degrees towards the field periphery. When receptive-field areas are considered, the representation at the 0-deg horizontal meridian extends to -3.6 deg and to beyond 20 deg at other elevations. In contrast, the visual-field representations in flanking areas 17 and 18 are essentially limited to the contralateral hemifield. The presence of a distinct representation of part of the ipsilateral hemifield in the transition zone suggests that the zone may have connections distinctly different from those of the adjacent areas. The observations bear on the problems of understanding the visual pathways in hypopigmented cats and binocular disparity mechanisms about the midline.

Keywords

Visual cortexMapElectrophysiologyReceptive fieldsVision
Type
Research Articles
Information
Visual Neuroscience , Volume 4 , Issue 5 , May 1990 , pp. 445 - 474
Copyright
Copyright © Cambridge University Press 1990

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