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Orientation column
About: Orientation column is a research topic. Over the lifetime, 1142 publications have been published within this topic receiving 130169 citations.
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TL;DR: Rheusus monkeys were trained to discriminate the angular velocity of moving stimuli and to reach accurately toward lighted targets and were able to recover good performance of these tasks after large bilateral lesions that removed all of striate cortex and almost all of areas OA, OB, and TEO of preoccipital cortex.
60 citations
TL;DR: Differences in pRF size and CMF vary gradually with polar angle and are not limited to the meridians or visual field map discontinuities, which may underlie consistent reports of asymmetries in perceptual abilities.
60 citations
TL;DR: This paper shows how both self-organization and segmentation can be achieved in such an integrated network, thus presenting a unified model of development and functional dynamics in the primary visual cortex.
60 citations
TL;DR: It is observed that the vast majority of parvalbumin-immunoreactive synaptic contacts in the primary visual cortex of Macaca fascicularis are of the symmetric type, and these neurons are known to be inhibitory and to form symmetric synapses.
59 citations
TL;DR: In this paper, patterns of connections within rat visual cortex were studied in an effort to better define its organizational layout, and it was suggested that the extrastriate band adjoining striate cortex has a single, global map organization.
Abstract: The definition of visual areas is one of the central problems in visual cortex research. Rodent extrastriate cortex offers a striking example of the complexity of this issue, in that different parcelation schemes identify within it from 2 to as many as 13 separate visual areas. In the experiments reported here, patterns of connections within rat visual cortex were studied in an effort to better define its organizational layout. The experimental paradigm used consisted of the following steps: first, the pattern of callosal connections was revealed in vivo with the fluorescent tracer bisbenzimide. Then, using the callosal pattern as a landmark, single injections of WGA-HRP were placed at various sites in striate and extrastriate cortex. Subsequently, the relation between the tangential distribution of ipsilateral corticocortical connections, the callosal connections, and the borders of striate cortex were examined in the flattened cortex preparation. The experiments revealed widespread, patchy connections within rat visual cortex. These connections appeared to reflect 3 organizational trends. First, neighboring sites were more extensively connected than distant ones. Second, extrastriate sites receiving common striate cortex inputs tended to be interconnected. Finally, projections from opposite poles in striate cortex tended to form interdigitating patterns of connections in regions of overlap. Altogether these trends suggest that the extrastriate band adjoining striate cortex has a single, global map organization. However, within the global map, a clear modular organization was evident, which appeared to correspond to the multiple visuotopic representations reported for this region. Based on its location, and some organizational similarities. it is suggested that the global map may constitute the rat homolog of area V2 in cat and monkey.
59 citations