1. Stereopsis and Surface perception: part 2

2. Review Wheatstone stereopsis: Near, far, uncrossed disparities
Da Vinci stereopsis: Monocular occlusion
Quadrature model

9. Why is Quadrature not enough?

10. Why is Quadrature not enough?
We perceive surfaces, that can be slanted or tilted, not points
Occlusion relationships
Absolute distance perception

11. L*(-R)=-L*R

13. Texture segregation happens AFTER surface perception

16. Large field disparity checkerboard stimulus
Dynamic random dot stereogram of 6x8 checkerboard
Disparity of checks vary between near (0.8 deg) and far (0.8 deg)
ABABAB…. block design

17. Large field disparity checkerboard stimulus
Dynamic random dot stereogram of 6x8 checkerboard
Disparity of checks vary between near (0.8 deg) and far (0.8 deg)
ABABAB…. block design

22. Average time course in V3A and CIPS

31. Tsutsui 2002

33. Tsutsui et al., J Neurosci 2003

37. Neural mechanisms for size and distance perception

40. Dobbins and Allman, Science, 1998