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Characteristics of intracellular on - off responses of amacrine cells of the dark-adapted carp retina

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The dependence of the amplitude and latent period of intracellular on and off responses of the amacrine cells of the isolated, dark-adapted carp retina on the intensity and diameter of the light spot was investigated. On and off responses of amacrine cells to light were shown to consist of fast depolarization responses with oscillations and spikes superposed upon them. With an increase in the intensity and area of the stimulus the latent period of the on response decreases but that of the off response increases. A near-linear relationship was found between the amplitude of the on response and the logarithm of the diameter of the spot up to 3 mm during changes in stimulus intensity of not more than 4 logarithmic units. With an increase in stimulus intensity the amplitude and zone of summation of the off response are reduced; it is suggested that under these circumstances this decrease may be connected with the different amplitude and temporal characteristics of off processes in the bipolar cells converging on the amacrine cells.

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Additional information

M. V. Lomonosov State University, Moscow. Translated from Neirofiziologiya, Vol. 7, No. 6, pp. 624–631, November–December, 1975.

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Yusupov, R.G., Suponitskii, V.L. & Gusel'nikov, V.I. Characteristics of intracellular on - off responses of amacrine cells of the dark-adapted carp retina. Neurophysiology 7, 484–489 (1975). https://doi.org/10.1007/BF01062791

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  • Latent Period
  • Temporal Characteristic
  • Stimulus Intensity
  • Bipolar Cell
  • Amacrine Cell