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PSYC 330: Perception Depth Perception

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The Puzzle The Real World and Euclidean Geometry The Retinal World and Projective Geometry Anamorphic art

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Discriminability (sensitivity, or d) Bias (criterion, or )

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The Tools Monocular Cues Binocular Cues

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Retinal Disparity differences in image falling on the two retinas Stereopsis -3D vision due to retinal disparity

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Astronomical Parallax

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A Demonstration The Finger Test 1. Retinal Disparity 2. Diplopia Horopter Panums Fusional Area

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The Research Stereoscopes and Stereograms

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Random Dot Stereograms

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The Correspondence Problem Which bits from the left eye should be matched with which bits form the right? Heuristics: Uniqueness Constraint every feature in left once, right once Continuity Constraint except at edges, close in image means similar distance

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Coding in the Brain Striate Cortex binocular cells with two receptive fields (one on each retina) Higher level processing

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Monocular Depth The Bob Ross Cues

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Pictorial Cues for Depth Relative Height in Field Aerial Perspective Texture Gradient Occlusion/Interposition Relative Size Familiar Size Linear Perspective

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Non-Pictorial Cues Accommodation of Lens Convergence/Divergence of Muscles Motion Parallax

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Putting the Cues Together Committees and Statistics Penny example on pg 157 Bayes Theorem judgment of event probability influenced by prior events Disagreeing Committee members