The Journal of General Physiology
Axon Instruments microelectrode amplifiers
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The Journal of General Physiology, Vol 82, 573-598, Copyright © 1983 by The Rockefeller University Press

ARTICLES

Spatial and temporal properties of luminosity horizontal cells in the turtle retina

D Tranchina, J Gordon and R Shapley

Luminosity horizontal cells in the turtle retina respond approximately linearly to visual stimuli with contrast levels spanning a large part of the physiological range. We characterized the response properties of these cells under conditions of low photopic background illumination by measuring their spatial and temporal frequency transfer functions. Our experimental results indicate in two ways that, under these conditions, feedback from luminosity horizontal cells to cones does not play a major role in the mechanisms underlying the spatial and temporal tuning of horizontal cell responses. First, the shape of the spatial transfer function depended only weakly on the temporal frequency with which it was measured. Second, the shape of the temporal transfer function depended only weakly on the spatial frequency with which it was measured.
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