PSYCH261 Lecture Notes - Lecture 10: Color Vision, Blindsight, Retina
28 Nov 2015
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Document Summary
Reduction of activity in one neuron by activation of its neighbours. By activating one neuron, that neuron will inhibit activation of others. Light hits receptor, hits corresponding bipolar cell and also hits horizontal cells. Horizontal cells are connected to a number of bipolar cells (inhibits some of the bipolar cells) Reduced amount of inhibition as you go away from the site of excitation (down the horizontal cells) Lateral inhibition (inhibits strongly to the bipolar cells beside the site of excitation) Allows the retina to emphasize and sharpen the contrast at the edge of the transition. Horizontal cells are also activated when receptor activates corresponding bipolar cells. Most excitation from the edge bipolar cells because there is not as much inhibition as the ones that are in between the excited bipolar cells. Neighbouring cell of the edge bipolar cells get some inhibition with very little excitation, rest are low activity.
