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NEU 220 Vision 4

Color Vision

2 Theories of Color Perception Trichromatic Theory, Opponent-Process Theory
Trichromatic Theory Color vision is comprised of 3 mechanisms with varying respective sensitivities.
Trichromatic: Distributed coding All 3 types of opsin respond to wavelength, and combine to form color perception.
3 Types of Opsin Short (Blue), Medium (Green-Yellow), Long (Yellow-Orange)
Opponent-Process Theory Cells respond to a certain color with rapid firing, while responding to its opposite with lateral inhibition.
Wavelength and color detection Wavelength is NOT the same as/all that is required for color perception.
3 Types of Colorblindness Monochromat, Dichromat, Anomalous Trichromat
Monochromat Truly colorblind; no cones, cannot perceive color. Low visual acuity, high light sensitivity.
Dichromat (3 types) 2 out of 3 cones are present; Protanope, Deuteranope, Tritanope.
Dichromat: Protanope RED/G Colorblindness; missing L cone
Dichromat: Deuteranope R/GREEN Colorblindness; missing M cone.
Dichromat: Tritanope BLUE Colorblindness; missing S cone. Not X-linked, most rare.
Anomalous Trichromat Seeing colors with shifted wavelength curves. Opsin mutation; alters color perception.
Created by: pichelle
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