Lecture 27-visual cortexII

Visual perception of motion is mediated by area mtv5

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Visual perception of motion is mediated by area MT/V5 Neurons in MT are exquisitely sensitive to motion Inactivation of columns in MT causes specific deficit in motion perception Electrical stimulation in MT can alter motion perception in monkeys
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Felleman and Van Essen
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Includes V3 - form w/ motion and V5 -pure motion (“what” pathway) (“where” pathway)
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Clinical evidence for two streams Damage in the ventral stream (V4) can lead to color blindness Damage to areas in the temporal lobe can lead to prosopagnosia – inability to recognize faces Damage to areas in the dorsal stream (MT) can lead to motion blindness
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Summary 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:
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  • Spring '08
  • DRAPER
  • visual cortex, ocular dominance columns, Binocular vision

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