BU PSYC 351 - Unit 2 Study Guide (14 pages)

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Unit 2 Study Guide



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Unit 2 Study Guide

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Spring 2018 Complete study guide/chapter summaries for unit 2


Pages:
14
School:
Binghamton University
Course:
Psyc 351 - Experimental Psyc - Perception

Unformatted text preview:

Unit 2 Study Guide Low Level Vision Lecture 1 The eye is very similar to a CAMERA because Both have lenses that focus light Both can adapt to overall light levels Both invert the original light source and compensate afterwards BUT The eye does NOT passively receive light like a camera The eye ACTIVELY processes like before it leaves the eye THE RETINA This is where all the magic happens transduction Light comes in from left to right But it is processed from right to left First light travels through rods and cones then bipolar cells then the ganglion cells ON OFF Bipolar cells ON Bipolar Cells if the rods cones sense light these bipolar cells increase firing rate They like light OFF Bipolar Cells if the rods cones sense light these bipolar cells decrease firing rate They dislike light Ganglion Cells ON OFF Bipolar cells connect to the ganglion cells ON Center Ganglion Cells The center is excitatory ON ON bipolar cells are in the center and the surround is inhibitory OFF OFF bipolar cells are in the surround OFF Center Ganglion Cell The center is inhibitory OFF OFF bipolar cells are in the center and the surround is excitatory ON ON bipolar cells are in the surround ON OFF Center Ganglion Cells respond differently to different light patterns pretty much light is and no light is so when light is hitting a spot in the ganglion cell that is it gets excited Firing rate increases When light hits the spots in the ganglion cell it gets inhibited Firing rate decreases When there is no light the firing rate stays the same If it was a 3D distribution it would look like a sombrero positive is high and negative is low Ganglion Cells are tuned to different spatial frequencies The black and white barcodes The number Grating Cycles in a given unit of space one set of black and white They are commonly studied with Garber patches Low Spatial Frequency not many bars High Spatial Frequency a lot of bars They are tuned to different spatial frequencies so if the part of the sombrero is in



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