day23 - Psychology 2050 Perception Day 23 16 November 10...

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Unformatted text preview: Psychology 2050 Perception Day 23 16 November 10 2nd prelim, 18 Nov 2nd prelim: in class, Thurs 18 Nov it includes: lectures from days 13-24 text chapters 3-5, 7-10, & parts of 16 review session: W 17 Nov, 202 Uris, 6:30 PM Motion and Film kinds of motion: long-range, apparent motion short-range, real motion flicker and motion cinema and the evolution of film being there & Hollywood style film cuts and shot-to-shot structure Form V3 form front back back outside surface inside surface and cutaway MT Sometimes called V5 Day 27 Properties V3 V4 MT color no yes no luminance yes some yes high spatial frequencies yes no no orientation yes no yes movement (bidirectional) yes no yes movement (unidirectional) no no yes stereopsis no no yes FORM COLOR MOTION & DEPTH Day 20 no motion real motion, and long-range motion no motion real motion apparent motion several degrees apart again long-range motion no motion registration in V1 (layer 4b) motion registered in V3 & MT (based on spatial discrepancies) not very compelling short range motion = real motion registered in V1, V3, & MT, neurophysiologically indistinguishable (most of the time) random coherent how is motion detected? ? Reichardt detector Use same receptors, different delay circuit and different comparator Use same receptors, different delay circuit and different comparator Problem: will detect motion and flicker Flicker a problem for visual system: discuss later detecting different velocities? 2 options: 1. increase or decrease delay 2. Increase or decrease distance between the two receptors Some variation in delay but generally distance is most important fast slow 5-40 ms is the temporal tolerance window for the motion detection from the pool of Reichardt detectors Each detector pool is somewhat sloppy, but comparing outputs of various pools gives good temporal resolution a b Receptor density declines with eccentricity. If hookup of motion (Reichardt) detectors stays constant with distance across the retina (~nth neighboring cell) motion sensitivity to more rapid motions will increase with eccentricity-- and it does Day 14 need to know the temporal resolution of the human visual system motion vs flicker DeLange curve 1/3000 people have photosensitive epilepsy 50-60 frames/s...
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This note was uploaded on 01/27/2011 for the course PSYCH 2050 at Cornell University (Engineering School).

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day23 - Psychology 2050 Perception Day 23 16 November 10...

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