PSY 3108 Lecture Notes - Lecture 17: Lightdark, Visual Angle, Receptive Field
7 Sep 2016
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On-centre receptive fields: react most to stimulus that fills center perfectly, filling entire field results in signals that are balanced out, same for off-centre receptive fields, but signals reversed. Receptive fields smaller closer to center of retina. Both on- (bright dot) and off- (dark dot) receptive fields in retina. Basic processing (light or dark features, size of feature) done by retinal ganglia before signals reach the brain. A lot of examples use on-centre cells, but there are an equal number of off- centre in retina as off-centre. Weirdness" of bipolar cells (ones that respond to light fire more when exposed to less glutamate and vice versa) make up for other weird bits in signal chain. Don"t fully understand what amacrine cells do: know that they connect ganglion cells to each other, but not sure for what purpose. Each circle receptive field is made up of many receptors that feed to the same ganglia.
