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Visual System III

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Biological Sciences

Outline of Lecture 66 (03-27 A; Connor) Visual System III – Dorsal Pathway I. Introduction to the dorsal pathway - The dorsal pathway processes depth and motion - Components of the dorsal pathway are V1, V2, V3, middle temporal (MT), medial superior temporal (MST), intraparietal regions (lat., vent., med., ant.), and area 7a - Lesions in the human parietal cortex can cause - Attentional hemineglect: neglect of contralateral space, also manifested in memory - Constructional apraxia: inability to reproduce complex objects II. V1, V2: lower level processing of stereoscopic vision - 3D depth perception is achieved by stereopsis: there is a slight disparity between the images on the two retinas - Both V1 and V2 are tuned to binocular image disparity and motion direction III. MT: intermediate level processing - MT cells respond to motion direction and speed, as well as to binocular disparity - MT receptive fields are larger than in lower levels - MT columns are organized in smooth gradients of direction preference and stereoscopic depth - Microstimulation of MT cells can bias perception of motion direction and depth IV. MST, VIP, LIP, MIP, AIP, 7a: higher level processing - Medial superior te
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