Abstract
Viewing an intense light depletes the store of regenerated photopigment within the receptors, thereby reducing the proportion of quanta in a subsequent stimulus that can be absorbed by the regenerated photopigment. This effect of photopigment depletion is often thought to play an insignificant role in the adaptation process. Although this appears to be true in the scotopic system, Rushton's densitometry measurements of the bleaching and regeneration of cone pigments are used here to show that in the photopic system photopigment depletion plays a substantial role in determining (a) darkadaptation thresholds, (b) the brightness of steady lights, (c) increment thresholds obtained against continuous backgrounds, and (d) simultaneous brightness contrast at high test- and inducing-field intensities. The effects of photopigment depletion on brightness were examined using a modified version of Craik's (1940) experiment.
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