Abstract
An intermittent light presented to a dark adapted frog eye produces a small “flicker ERG” (response to the individual light pulses). After light adaptation the flicker ERG increases drastically in amplitude. The preceding study using the isolated retina showed that adaptation strictly within the cone system could produce this increase. This study showed that in the intact frog light adaptation effected the increase in two ways: by modifying the cone system and by releasing the cones from some inhibitory element with an action spectrum of a 502 pigment, probably the red rods or accessory cones.
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