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VisSupp - CSl7 Neurobiology of Cognition Smlement to Vision...

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Unformatted text preview: CSl7 Neurobiology of Cognition Smlement to Vision Lecture RODS CONES Shape Outer Segment rod-like Outer Segment cone-like Size Larger (more photopigment) Smaller (less photopigment) # ~ 120 million/eye ~ 6 million/eye Distribution None in Fovea, highly conc’d in periphery High concentration in Fovea, dispersed in periphery Re: Ganglion Cells High Convergence Low Convergence Potential Graded potentials Graded potentials NT Spontaneously release Inhibitory NT Spontaneously release Inhibitory NT Photopigment I kind (Rhodopsin) 3 kinds (sensitive to Long, Medium, Short ls) Code Color No (dark/light only) Yes (Long, Medium, Short its) Motion Detection Excellent Poor Acuity Low High (esp in F ovea) Sensitivity High (can operate in dim light) Not as good (require brighter light) Pathway Magnocellular/Dorsal Stream Mostly ParvocellularNentral Stream Schematic of circuit for Direction- Sensitive Cells The “Motion Detector” cell at the bottom of this schematic would resp_ond to motion from right to leg, but NOT from lefi to right Memem W— E1 . ...
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