The Neural Control of Vision
G. The Function of the On and Off Channels in Vision


response of a V1 complex cell to a drifting light bar before, during and after APB infusionThis V1 complex cell shown in Figure 23 in V1 responds to both the light and dark edges of the bar that moves across its receptive field. It responds better to downward right movement that upward left movement, hence it exhibits moderate direction selectivity. APB blocks the light edge response but does not affect directionality.

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