The Journal of General Physiology
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The Journal of General Physiology, Vol 49, 565-593, Copyright © 1966 by The Rockefeller University Press

ARTICLE

Sinusoidal and Delta Function Responses of Visual Cells of the Limulus Eye

R. B. Pinter 1

1 From the Department of Electrical Engineering, Technological Institute, Northwestern University, Evanston, Illinois, and the Department of Electrical Engineering, University of Washington, Seattle, Washington.

Dr. Pinter's present address is the Department of Electrical Engineering, University of Washington, Seattle, Washington

Dynamic responses of visual cells of the Limulus eye to stimuli of sinusoids and narrow pulses of light superimposed on a nonzero mean level have been obtained. Amplitudes and phase angles of averaged sinusoidal generator potential are plotted with respect to frequency of intensity modulation for different mean levels of light adaptation. At frequencies above 10 CPS, generator potential amplitudes decrease sharply and phase lag angle increases. At frequencies below 1 CPS, amplitude decreases. A maximum of amplitude in the region of 1 to 2 CPS is apparent with increased mean intensity. The generator potential responses are compared with those of differential equation models. Variation of gain with mean intensity for incremental stimuli is consistent with logarithmic sensitivity of the photoreceptor. Frequency response of the photoreceptor derived from narrow pulses of light predicts the frequency response obtained with sinusoidal stimuli, and the photoreceptor is linear for small signals in the light-adapted state.

Submitted on April 21, 1965


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