L11-Dorsal and Ventral Streams

L11-Dorsal and Ventral Streams - Sensory Processes &...

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    PSY 343 Fall Session 2007 - Lecture 11 The Dorsal and Ventral Streams Instructor:  Sean Green
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    Recap - The Duplex Organization  of the visual system Receptors Retinal Ganglia LGN Striate Cortex Rod Cells Cone Cells M Ganglia P Ganglia Layers 1-2 Layers 3-6 Hypercolu mns Next… Next….
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    The dorsal and ventral streams After the striate cortex, visual  processing occurs in two different  pathways The Dorsal Stream travels toward the motor cortex in the parietal lobe passes through V2 and V3 to the medial temporal cortex (MT), and from there to the
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    The dorsal and ventral streams After the striate cortex, visual  processing occurs in two different  pathways The Ventral stream travels down along the sides of the head to the temporal lobe. It passes through V4 (V8 in humans)
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    The dorsal and ventral streams Why do we call them the dorsal and ventral  streams? Dorsal - Back Ventral - Stomach Words reflect the arrangement in other animals,  not humans Dorsal Ventral
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    The dorsal and ventral streams Diagram of the dorsal and ventral  streams V1 V1 V2 V2 V3 V4 MT IT Dorsal Stream Ventral Stream Temporal  Lobe Parietal   Lobe
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    The dorsal and ventral streams So what do the streams do? The Dorsal stream Continuation of the magnocellular pathway Detects motion (90% of cells in MT are sensitive to  motion) The Ventral stream Continuation of the parvocellular pathway. Cells in IT respond to complex shapes and 
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L11-Dorsal and Ventral Streams - Sensory Processes &...

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