PSYCH 2E03 Lecture 24: Sensitivity Resolution
3 Dec 2016
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Psych 2e03 lecture 24 sensitivity resolution. Recall distribution of rods and cones in retina. 126 million photoreceptors vs. 1. 25 million ganglion cells: signals from multiple photoreceptors must converge onto a single ganglion cell. Near the fovea, few photoreceptors converge upon a single ganglion cell. In general, the greater the retinal eccentricity, the greater the number of photoreceptor signals feeding into a ganglion cell: eccentricity: deviation from the centre. Dendrites of ganglion cells around the fovea are very constricted whereas those in the peripheral retina cover a much greater area: the receptive field of ganglion cells must also show systematic changes within retinal eccentricity. This would be expected simply because the receptive field is defined by the extent of the retina that influences a visual neuron. Ganglion cell located near the fovea has a much smaller receptive field compared to one located in the periphery: smallest receptive fields are found in the fovea.
