PSYC 271 Lecture 13: 271 6.2
22 Nov 2016
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Document Summary
Edge detection: perception of contrast between two adjacent areas of the visual eld, contrast enhancement. Contrast enhancement gives step wise grey scale bands the appearance of scalloped edges where middle is dark and edges are bright. Receptive fields of visual neurons: hubel and wiesel. Electrode is placed into retina of curarized subject. On ring in on centre - stimulation to centre will increase activity, stimulation to periphery will decrease activity. Off ring in off centre - stimulation to centre will reduce activity, stimulation to periphery will increase activity. Stimulating centre and periphery cancels out action: cortical cells. Striate cortex (v1: have rectangular receptive elds, are orientation sensitive, simple neurons. Monocular (receive information from one eye: complex neurons. Not location sensitive to stimulus because they receive information from simple cells: information sent from simple to complex. Columnar organization of primary visual cortex allows visual system to maintain retinotopic organization while processing basic components of visual input from each eye.
