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Stimulus dependence of orientation and direction sensitivity of cat LGNd relay cells without cortical inputs: A comparison with area 17 cells

Published online by Cambridge University Press:  02 June 2009

Kirk G. Thompson
Affiliation:
Department of Anatomy, University of Utah, School of Medicine, Salt Lake City
Audie G. Leventhal
Affiliation:
Department of Anatomy, University of Utah, School of Medicine, Salt Lake City
Yifeng Zhou
Affiliation:
Department of Biology, University of Science and, Technology of China, Hefei, Anhui 230026, People's Republic of China
Dan Liu
Affiliation:
Department of Anatomy, University of Utah, School of Medicine, Salt Lake City

Abstract

The cortical contribution to the orientation and direction sensitivity of LGNd relay cells was investigated by recording the responses of relay cells to drifting sinusoidal gratings of varying spatial frequencies, moving bars, and moving spots in cats in which the visual cortex (areas 17, 18, 19, and LS) was ablated. For comparison, the spatial-frequency dependence of orientation and direction tuning of striate cortical cells was investigated employing the same quantitative techniques used to test LGNd cells. There are no significant differences in the orientation and direction tuning to relay cells in the LGNd of normal and decorticate cats. The orientation and direction sensitivities of cortical cells are dependent on stimulus parameters in a fashion qualitatively similar to that of LGNd cells. The differences in the spatial-frequency bandwidths of LGNd cells and cortical cells may explain many of their differences in orientation and direction tuning. Although factors beyond narrowness of spatial-frequency tuning must exist to account for the much stronger orientation and direction preferences of cells in area 17 when compared to LGNd cells, the evidence suggests that the orientation and direction biases present in the afferents to the visual cortex may contribute to the orientation and direction selectivities found in cortical cells.

Type
Research Articles
Copyright
Copyright © Cambridge University Press 1994

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