Abstract

ERG responses of the Rhesus monkey obtained with monochromatic flickering light subtending 90° of visual angle indicate that the time-varying rod contribution to the ERG saturates at approximately 7×109 quanta sec−1 deg−2 at 502 mμ, a value slightly greater than that required for saturation of human rod vision. The action spectrum of both the dark adapted ERG and the saturation mechanism resembles the CIE scotopic luminosity function which suggests that both processes are mediated by the rod receptors. After rod saturation, the ERG action spectrum shifts to longer wavelengths, resembling human peripheral cone vision below 550 mμ but being less sensitive at longer wavelengths. At these light levels, the action spectrum is the same whether obtained with 4 or 20 cps square-wave flicker, which indicates that the rods are no longer contributing to the response.

© 1965 Optical Society of America

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