title: Effect of adapting target size on the gain of the surround response mechanism in X- and Y-cells in cat retina.
abstract: The adaptation field of the surround mechanism of X and Y retinal ganglion cells in the cat was assessed with variable size, unmodulated adapting spots. Both an on-inhibition measure and an off-discharge measure of surround gain was used. Results suggest that the surround mechanism in Y-cells is strongest in the receptive field middle but weak or nonexistent in the middle of X-cell receptive fields.
mesh_terms: D000818:Animals; D002415:Cats; D012160:Retina / Q000166:cytology / Q000502:physiology*; D014785:Vision, Ocular; D014796:Visual Perception