PSYCH 2GG3 Lecture Notes - Lecture 6: Edge Detection, David H. Hubel, Retina
12 Apr 2018
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Document Summary
Specificity of neurons in the visual system: different kinds of neurons have different receptive fields, e. g. Line orientation, edge detection, centre-surround, direction of movement. Lateral inhibition: when a cell is excited, it will inhibit the cells around it, cell c maximally stimulated, but receiving (lowered) inhibition from cell d (firing less). Systems and pathways within the visual system are also specialized to deal with different kinds of visual information: parallel processing. The binding problem: have to put it all back together, spatial position, rhythm, attention is the glue. Perception sensation: 3 main ideas, perceptual constancy, perceptual organization of forms. Figure/group separation: gestalt grouping principles, depth perception. Shape, orientation, colour: closure, proximity, good continuation, common fate (motion), all of these interact with each other to come up with an interpretation of what you are seeing, key is organizing the input into objects.
