sensation and perception II
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Junction of the optic nerves from each eye.
Projections from the retina to the lateral geniculate nucleus to the primary visual cortex.
Primary visual cortex (V1) in the occipital lobe. Striped appearance when stained
Projections from the retina to the superior colliculus to the pulvinar (thalamus) to the parietal and temporal visual areas
Dorsal Visual Stream
- Pathway that originates in the occipital cortex and projects
- to the parietal cortex
pathway (how action is to be guided toward objects)
Ventral Visual Stream
Pathway that originates in the occipital cortex and projects to the temporal cortex
The “what” pathway (identifies what an object is)
Organization that represents a functional unit of six cortical layers deep and approximately 0.5 mm square
perpendicular to the cortical surface.
Magnocellular cells from the retina project to the superior colliculus, which then sends information to the pulvinar (thalamus)
magnocellular cells -> superior colliculus -> pulvinar (Thalamus)
sends connections to the parietal lobe
sends connections to the temporal lobe
provides information regarding location "where"
Composed of 6 different regions
Primary Visual Cortex (V1)
Striate cortex that receives input from the lateral geniculate nucleus.
Extrastriate (Secondary Visual) Cortex
Visual cortical areas outside the striate cortex.
- Region in the visual cortex that contains color-sensitive neurons
- Revealed by staining for cytochrome oxidase
- Region that separates blobs
- Participates in perception of form and motion
receives information from movement-sensitive neurons
Receive information form color sensitive neurons
Receive information from form-sensitive neurons
inability to recognize objects or drawings of objects
Color Agnosia (Achromatopsia)
inability to recognize colors
Face Agnosia (prosopagnosia)
inability to recognize faces
- deficit in the visual control of reaching and other movements
- can recognize objects but can't reach out and grab it
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