Bio365-41-050710 (1) - Extrastriate areas Zeki A vision of...

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Extrastriate areas
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Zeki – A vision of the brain
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Includes V3 - form w/ motion and V5 -pure motion (“what” pathway) (“where” pathway)
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Ungerleider and Mishkin
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Evidence for two streams Clinical evidence from human Behavioral deficits following lesions in monkeys Anatomical evidence – retrograde tracer Electrophysiological evidence Human brain imaging
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Summary – Extrastriate areas Visual signals are processed by separate populations of neurons in V1 These signals are sent in parallel to two separate streams in which visual signal are processed in series The ventral stream is involved in object recognition (“what”) The dorsal stream is involved in processing motion and spatial locations (“where”)
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Serial and parallel processing Serial processing: increased specialization at the level of single cells Areas specialized for processing specific types of information Hierarchical organization Parallel processing
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Bio365-41-050710 (1) - Extrastriate areas Zeki A vision of...

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