Abstract
Both the kinetics of bleaching of bullfrog visual pigment extracts and the amplitude of the late receptor potential were studied using pH as a common experimental variable. The data indicate that variations in the receptor potential amplitude are directly correlated with variations in the thermal kinetics of the visual pigment. Our interpretation of the data leads to the conclusion that the amplitude of the late receptor potential is inversely proportional to the rate of accumulation of metarhodopsin II. This implies that the receptor response involves inhibitory as well as excitatory processes. It is proposed that metarhodopsin II is intimately associated with the mechanism of inhibition.
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