PSYC 2390 Chapter 9: Chapter 9 (Part 2)
7 Feb 2012
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Document Summary
Affecting only about 0. 002% males 0. 001% females. Blue at short wavelengths, red at long wavelengths, neutral point . Most monochromats have no color vision; have one type of cone or no cones. Dichromats are missing one visual pigment: with protanope missing the long wavelength pigment, deuteranope missing medium wavelength pigment, tritanope"s rarity because of the low number of short-wavelength cones. In normal retinas, difficult to determine which pigment tritanopes are missing, probably missing the short wavelength pigment. Identified differences in genes that determine visual pigment structure in trichromats & genes that determine visual pigment structure in trichromats & dichromats. Based on research, anomalous trichromats probably match colors differently from normal trichromats; difficulty discriminating between some wavelengths because m & L pigment spectra have been shifted closer together. Ewald hering used the results phenomenological observations, which stimuli were presented & observers described what they perceived, to propose opponent-process theory of color vision.
