1. PSYC 330: Perception Depth Perception

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

3.  Discriminability (sensitivity, or d’)  Bias (criterion, or  )

4. The Tools Monocular Cues Binocular Cues

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

6. Astronomical Parallax

7. A Demonstration The Finger Test 1. Retinal Disparity 2. Diplopia Horopter Panum’s Fusional Area

8. The Research Stereoscopes and Stereograms

9. Random Dot Stereograms

10. 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

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

12. Monocular Depth The Bob Ross Cues

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

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

17. 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