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Sensation and Perception -ascendvis.ppt © 2001 Dr. Laura Snodgrass, Ph.D.1 Ascending Visual Pathway Geniculostriate pathway –form and detail Tectopulvinar pathway –motion and location Both pathways start with the optic nerve leaving the eye
Sensation and Perception -ascendvis.ppt © 2001 Dr. Laura Snodgrass, Ph.D.2 Both Pathways Go To The Optic Chiasm Nasal retina Occipital lobe
Sensation and Perception -ascendvis.ppt © 2001 Dr. Laura Snodgrass, Ph.D.3 Optic Chiasm At the optic chiasm –fibers from the nasal hemiretinas cross to the opposite hemisphere –fibers from the temporal hemiretinas continue to the same hemisphere Retinotopic mapping –the spatial relationships on the retina are preserved in cortex
Sensation and Perception -ascendvis.ppt © 2001 Dr. Laura Snodgrass, Ph.D.4 Lateral View Of Visual Pathways
Sensation and Perception -ascendvis.ppt © 2001 Dr. Laura Snodgrass, Ph.D.5 Subdivisions Of The Occipital Lobe
Sensation and Perception -ascendvis.ppt © 2001 Dr. Laura Snodgrass, Ph.D.6 Geniculostriate Pathway Optic chiasm –cross over LGN –selective attention Occipital areas –17 - simple cells –18 - complex cells –19 hypercomplex cells Temporal lobe –object identification
Sensation and Perception -ascendvis.ppt © 2001 Dr. Laura Snodgrass, Ph.D.7 Tectopulvinar pathway Optic chiasm (cross over) Superior colliculus –location mapping Occipital lobe –18 - motion –19 - complex motion Temporal lobe –combine visual information
Sensation and Perception -ascendvis.ppt © 2001 Dr. Laura Snodgrass, Ph.D.8 Two Ascending Visual Pathways
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