4_pathways - Pathways->(LGN Parallel Processing Streams...

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1 Pathways -> (LGN) Parallel Processing Streams Magnocellular “where” vision motion, contrast, depth parietal lobe spatial orientation Parvocellular “what” vision form, color, depth temporal lobe object recognition 6 layers each layer from 1 eye 4 layers from parvocellular 2 layers from magnocellular Lateral Geniculate Nucleus (LGN) Lateral Geniculate Nucleus (LGN)
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2 Hubel & Wiesel (1962) - orientation - ocular dominance - retinal position Seeing the World in 3D “Cues” to the lost third dimension • Monocular/Pictorial – Cues that are available in the 2D image Occlusion
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3 Height in the Field of View Atmospheric Perspective Linear Perspective Linear Perspective & Texture Size and Distance Emmert’s Law S p = C(S r x P p ) where S p = perceived size S r = retinal size P p = perceived distance
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4 Ames Room Shading and more... Seeing Depth The Cue Approach • Binocular – stereopsis • disparity – oculomotor cues Muscle proprioception
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5 Disparity = q 1 -q 2 q 1 q 2 Perceiving Objects and Forms Task Surface perception a complete 3D representation or map of scene - motion, stereo etc. segment into “figure” and “ground” Segment/parse into objects Which points in map belong to same objects? Recognize and identify objects represent, remember and match to memory Scene perception layout of objects Events
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