click below
click below
Normal Size Small Size show me how
NEU 220 Vision 4
Color Vision
Question | Answer |
---|---|
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. |