Stereopsis and Surface perception: part 2

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Presentation transcript:

Stereopsis and Surface perception: part 2

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

Why is Quadrature not enough?

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

L*(-R)=-L*R

Texture segregation happens AFTER surface perception

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

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

Average time course in V3A and CIPS

Tsutsui 2002

Tsutsui et al., J Neurosci 2003

Neural mechanisms for size and distance perception

Dobbins and Allman, Science, 1998