Area effects and the rapid threshold decrease in early dark adaptation*

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Abstract
At the beginning of dark adaptation there is a sudden decrease of threshold that appears distinct from the subsequent course of regular dark adaptation. The present research indicates that the decrease cannot be a result of losing the lateral inhibitory effects that occurred during the light adaptation prior to dark adaptation. The results thus imply that the early threshold drop must be based on a process somewhere in the direct line from receptor to higher centers.

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