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Su11Homework2 - CS17 * SSII 08 Name_ HOMEWORK 2 PERCEPTUAL...

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CS17 * SSII 08 HOMEWORK 2 Name______________________________ PERCEPTUAL SYSTEMS When a stimulus is coded through the RATIO of response across multiple cells When multiple pre-synaptic cells all communicate to one post-synaptic cell When one presynaptic cell communicates to many post-synaptic cells Set of receptors whose actitvity influences the activity of target cell Type of above: stimulating center increases target response, non-center decreases it Type of map that preserves spatial relaitonships (as along a sensory surface) In cortex, disproportionate enlargement of the rep. of a sensory area of low convergence An area of the brain specialized for processing one particular type of information The problem posed by having several of the above, and yet perceiving wholes VISION Rear layers of neurons in the eyeball Cells that respond to light; show spontaneous, graded release of inhibitory NT Central area of above receptor types only, connected 1:1 for highest acuity Next cell in pathway, spontaneous, graded potentials, release excitatory NT Inter-neurons that modify reaction of above, implicated in color opponency Next cell in pathway, action potentials, release excitatory NT Formed of axons of the above Place where above leaves eye for brain, also called "Blind Spot" Inter-neurons that modify reaction of above, implicated in contrast effects Level of light (bright vs. dim?) that results in greatest release of NT from receptors Level of light (bright vs. dim?) that results in greatest release of NT from bipolars High-detail discrimination, as from low convergence, that retains info on diffs High likelihood of detection, as from high convergence that crosses next cell's threshold Cell activity resulting in release of inhibitory NT to cells orthogonal to info pathway Illusion created by above that alters perception of central grey depending on its surround Direction of inhibition (uni- or bi-directional?) in direction-senstive motion circuit Nucleus in Thalamus that processes most visual information from eye In cortex, set of cells, in 6 layers, that all respond to the same preferred stimulus Topological map that preserves spatial relationships found on Retina Primary Projection area for vision in Occipital Lobe of cortex Visual pathway specialized for color and detail, that "flows" along bottom of cortex Above also called. ..because it terminates in this lobe of the cortex Above also called…because it conveys info that helps you to identify a stimulus or individual Visual pathway specialized for motion and localization,"flows" along top part of cortex Above also called …because it terminates in this lobe of the cortex
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This note was uploaded on 09/07/2011 for the course COGS 17 taught by Professor Pineda during the Spring '06 term at UCSD.

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Su11Homework2 - CS17 * SSII 08 Name_ HOMEWORK 2 PERCEPTUAL...

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