Abstract
A detailed examination was made of the responses of Necturus retinal ganglion cells to stationary and moving stimuli, with the aim of assessing the degree of response specificity of on-off cell “motion detectors”. Responses to stationary and moving stimuli were recorded while changing one stimulus parameter (intensity, size or duration) in the same manner for both stationary and moving stimuli, with all other stimulus parameters fixed. Sustained-on cells were used as controls, since they are not particularly movement sensitive. No pronounced or systematic differences were observed between the ways the responses of on-off cells to stationary and moving stimuli depended on the three stimulus parameters. In no case were the differences in response dependence more pronounced for individual on-off cells than for some sustained-on cell. Therefore, Necturus on-off ganglion cells should not be considered “motion detectors”.
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