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J Neurophysiol 38: 1524-1540, 1975;
0022-3077/75 $5.00
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Journal of Neurophysiology, Vol 38, Issue 6 1524-1540, Copyright © 1975 by APS

ARTICLES

Direction selectivity of complex cells in a comparison with simple cells

A. W. Goodwin and G. H. Henry

Following our earlier study on direction selectivity in simple cells (5), the present findings on complex cells made it possible to compare the direction selectivity in the two types of striate cell. Common properties were found in the dimension of the smallest stimulus displacement giving a direction-selective response and in the role of inhibition in suppressing the response as the stimulus moved in the nonpreferred direction. However, the effectiveness of this inhibition varied in the two cell types since it suppressed both driven and spontaneous activity in the simple cell, but only driven firing in the complex cell. It is argued that direction selectivity must enter the response before the complex cell if the inhibition responsible for it's generation fails to influence the spontaneous activity of the cell. The consequences of this finding are considered in the terms of parallel or sequential processing of visual information in striate cortex.


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