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1. When Y-type cat retinal ganglion cells were driven by cones, the i.v. administration of the GABA-antagonist picrotoxin failed to alter receptive field centre size. 2. This result is in marked contrast to our previous finding that when Y-cells were driven by rods, GABA-antagonists led to specific and reversible changes in centre size. 3. These results taken together suggest that for centre signals of Y-cells, the rod and cone pathways are pharmacologically distinct.

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