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Effects of Lesions on Visual Perception of Motion in Humans We study motion processing abilities of patients with demonstrated focal lesions, in the occipital, temporal or parietal lobes. The patients' deficits are also characterized on neurological, neuropsychological, neuro-ophthalmological and neuroanatomical dimensions. Building on our previous work and guided by current knowledge of visual motion processing in the macaque and by biologically based computational theories of motion processing, we developed a set of psychophysical motion tasks (Core Visual Motion Tests) designed to critically evaluate several central problems in visual motion processing. Our studies currently focus on: 1) the relationship between the mechanisms of first order motion and second order motion and their neuro-anatomical substrate in the human visual system, 2) the perception of boundaries and three-dimensional structure from motion, and 3) the hierarchical organization of motion processing in humans.
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