By adjusting to equivalence the stimulating effectiveness of light and x-rays, the processes of adaptation were measured by rate of optic nerve unit discharge. Light adaptation is a simple exponential function. Adaptation to x-irradiation is a complex function composed of an early exponential decay in response rate and a late exponential rise in response rate. The response to light returned to normal 3 minutes after x-ray adaptation was terminated. The hypothesis that light and x-rays have identical effects on rhodopsin-bearing visual systems was not supported.

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