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

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Abstract
Luminosity horizontal cells in the turtle retina respond approximately linearly to visual stimuli with contrast levels spanning a large part of the physiological range. The response properties of these cells were characterized under conditions of low phototopic background illumination by measuring their spatial and temporal frequency transfer functions. Experimental results indicate in 2 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. The shape of the spatial tranfer function depended only weakly on the temporal frequency with which it was measured, and the shape of the temporal transfer function depended only weakly on the spatial frequency with which it was measured.