PSYC 330: Perception

PSYC 330: Perception Depth Perception

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

Discriminability (sensitivity, or d’) • Bias (criterion, or b )

Monocular Cues Binocular Cues The Tools

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

Astronomical Parallax

The Finger Test 1. Retinal Disparity 2. Diplopia Horopter Panum’sFusional Area A Demonstration

Stereoscopes and Stereograms The Research

Random Dot Stereograms

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 The Correspondence Problem

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

Monocular Depth The Bob Ross Cues

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

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

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

PSYC 330: Perception