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J Neurophysiol 39: 1352-1361, 1976;
0022-3077/76 $5.00
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Journal of Neurophysiology, Vol 39, Issue 6 1352-1361, Copyright © 1976 by APS

ARTICLES

Quantitative studies of single-cell properties in monkey striate cortex. IV. Corticotectal cells

B. L. Finlay, P. H. Schiller and S. F. Volman

1. The receptive-field properties of corticotectal cells in the monkey's striate cortex were studied using stationary and moving stimuli. These cells were identified by antidromic activation from the superior colliculus. 2. Corticotectal cells form a relatively homogeneous group. They are found primarily in layers 5 and 6. These cells can usually be classified as CX-type cells but show broader orientation tuning, larger receptive fields, higher spontaneous activity, and greater binocular activation than CX-type cells do in general. A third of the corticotectal cells were direction selective. 3. These results suggest that the cortical input to the superior colliculus is not directly responsible for the receptive-field properties of collicular cells. We propose that this input has a gating function in contributing to the control of the downflow of excitation from the superficial to the deep layers of the colliculus.


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