Abstract
The spatial spread of rapid light adaptation was quantitatively studied in the frog retina by simultaneously recording the impulse discharge of a single on-off neuron along with a local graded potential, The Proximal Negative Response (PNR). The neuron's adaptive field profile (AFP) was mapped with small spots of variable position and found to be much narrower than the neuron's excitatory receptive field and nearly identical to the AFP of the PNR. The adapting and excitatory effects of concentric spots of variable radius yielded similar radiussensitivity curves for PNR and neuron. Implications of these and other findings for lateral mechanisms of adaptation, amacrine-ganglion cell coupling and movement detection are discussed.
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