RECEPTOR POTENTIAL OF VERTEBRATE RETINA

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Abstract
Responses to illumination of carp retinae were investigated by means of a KCl-filled microolectrode with a tip diameter less than 0.5 [mu]- Most elements gave a slow negative response, as was shown by Svaetichin, but some elements positive or negative responses according to the wavelength of the light used. The relation between amplitudes of responses and wavelengths of lights from an equal-energy spectrum was investigated in 105 elements. Each curve showed a dominant maximum and a few submaximal humps. Maxima appeared at 4 parts of the spectrum, namely at about 650, 600, 550 or 470 m[mu]. Spectral sensitivity curves were obtained from 152 elements. Submaximal humps were sometimes very conspicuous, and their spectral location was restricted to the 4 parts of the spectrum mentioned above. When a negative response happened to be recorded together with spike potentials by one and the same microelectrode, it was found that the negative response was accompanied by inhibition of spontaneous spikes.

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