Journal article

ORIENTATION SENSITIVITY OF CAT LGN NEURONS WITH AND WITHOUT INPUTS FROM VISUAL CORTICAL AREA-17 AND AREA-18

TR VIDYASAGAR, JV URBAS

Experimental Brain Research | SPRINGER VERLAG | Published : 1982

Abstract

Orientation sensitivity was tested, using moving bars as stimuli, in 136 LGN cells in normal cats and 82 LGN cells in cats with areas 17 and 18 lesioned. The responses of most neurones showed some dependence on the orientation of the line stimulus. The orientation bias was more pronounced for long, narrow bars moving at rather slow velocities. Length-response curves revealed less end-inhibition along the optimum orientation than along the non-optimum orientation. Thiry-two percent of the cells in the normal cats and 50% in the lesioned animals responded best to orientations within 10 degrees of the vertical or horizontal. The oblique orientations were represented poorly in the lesioned group..

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