Inhibitory processes underlying the directional specificity of simple, complex and hypercomplex cells in the cat's visual cortex

1. The iontophoretic application of bicuculline, an antagonist of GABA, the putative inhibitory transmitter in the visual cortex, has been used to examine the contribution of post‐synaptic inhibitory processes to the directional selectivity of simple, complex and hypercomplex cells in the cat's striate cortex.

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