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1-30-S_P-Vision2 - Vision II Vision II Visual Pathways...

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1 Vision II Vision II Visual Pathways Color Vision Visual Pathways There are two neural pathways from the retina to the cortex: 1. Retinocollicular pathway » Minor source of input 2. Retinogeniculate pathway » Major source of input!! Neural pathway : the route which information follows in the nervous system
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2 Retinocollicular Pathway Retina Superior Colliculus Pulvinar Nucleus of the Thalamus Optic Nerve Parietal Cortex Retinogeniculate Pathway Retina Lateral Geniculate Nucleus (LGN) of the Thalamus Primary Visual Cortex (V1) Optic Nerve Blindsight Blindsight (“vision without awareness”) – Individuals rendered cortically blind (V1 damage) may still be able to perform simple visual tasks even though they do not have conscious vision E.g., able to point to a stimulus but could not describe it – Blindsight is due to rudimentary visual information entering the brain via the retinocollicular pathway
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3 Dorsal & Ventral Pathways From primary visual cortex (V1), there are two major pathways of visual processing: the dorsal stream and the ventral stream Dorsal & Ventral Streams Retinocollicular Pathway Retinogeniculate Pathway Dorsal Stream Ventral Stream Dorsal & Ventral Streams Dorsal Stream = “Where” Pathway The dorsal stream involves the dorsal flow of visual information from V1 to
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