08_Perception

08_Perception - PSY 101: General Psychology Sensation and...

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Unformatted text preview: PSY 101: General Psychology Sensation and Perception Color Vision The Young-Helmholtz or TRI CHROM ATIC theory Color vision depends on the relative rate of response by the three types of cones. Each type of cone is most sensitive to a specific range of electromagnetic wavelengths. Short wavelengths are seen as blue. Medium wavelengths are seen as green. Long wavelengths are seen as red. Figure 4.13 Sensitivity of three types of cones to different wavelengths of light. (Based on data of Bowmaker & Dartnall, 1980) http://www.sinauer.com/wolfe/chap5/univ arianceF.htm http://www.sinauer.com/wolfe/chap5/trichr omF.htm Color Vision The Opponent-Process Theory TRI CHROM ATIC theory does not account for some of the more complicated aspects of color perception. E.g.,People experience four colors (not 3) as primary red, green, blue and yellow. Experience of color afterimages Green Red Blue Yellow + Stare at the dot The Theory (Hering ) We perceive color not in terms of separate categories but rather in a system of paired opposites . IN LATERAL GENICULATE NUCLEUS L+M signal (brightness, no color) L-M signal (L+M) - S BUT ALSO elsewhere in the brain Color Vision NOTE: enrichment reading on click if confused regarding what opponent processes are useful for. Color Vision...
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This note was uploaded on 04/07/2008 for the course PSY 101 taught by Professor Gauthier during the Spring '08 term at Vanderbilt.

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08_Perception - PSY 101: General Psychology Sensation and...

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