Ganglion cell discharge and proximal negativity in the pigeon retina.

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Abstract
Proximal negativity was compared with the spike responses and membrane responses of pigeon ganglion cells. Spike discharge peaks developed during the rising phase of proximal negativity. Proximal negativity was never directional, even when recorded concurrently with directional ganglion cells. To moving stimuli, on-center cells respond in association with the leading edge of the stimulus, off-center cells with the trailing edge and on-off cells with the leading and trailing edges. Proximal negativity was produced in association with the leading and trailing edges. Quasi-intracellular records showed that discharge peaks occurred in association with depolarizing potentials. The synaptic responses of on-off cells bore a closer resemblance to the proximal negative response than did the responses of on-center cells, off-center cells or directional cells.