Abstract
Under the best conditions, single ganglion cells of the cat's retina give one extra impulse (average) for less than 3 quanta (average) at the cornea. A stimulus containing about 15.50 quanta at the cornea is required to reliably modulate the maintained discharge. Calculations suggest that when a single quantum is absorbed in the retina several extra impulses must be initiated. This is confirmed by the statistics of the response. For quanta absorbed in receptors in the periphery of the receptive field fewer impulses result, and this is confirmed by reduced variability of response.
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