Abstract
AbstractThis paper discusses the propagation of potentials in the receptor field of horizontal cells in the retina and the linearity of response of horizontal cells with respect to the photoreceptor input. A microelectrode is inserted into the L‐type horizontal cells of carp and, by stimulating various portions of the retina by a small light spot, the response potential of L‐type horizontal cells is measured. As a result, the amplitude of the response potential exhibits a decay depending only on the distance between the horizontal cell and the point of stimulus, without any directivity in the propagation of potential. In other words, it is shown that the receptor field of the L‐type horizontal cells is spatially uniform with respect to the propagation of potential. On the other hand, when the input from the photoreceptor, is increased by increasing the light spot intensity or by using a wavelength of higher sensitivity, the spatial decay of the response potential of L‐type horizontal cells decreases. This result seems to indicate that L‐type horizontal cells have a saturating nonlinearity in regard to the input from the photoreceptor. The response characteristics of the horizontal cells in this paper are essential in the analysis of color information processing or picture information processing in the retina.
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