PSY 1101 Lecture Notes - Lecture 6: Color Blindness, Color Vision, Trichromacy

• School: University of Ottawa
• Department: Psychology
• Course: PSY 1101
• Professor: Mark Dallas

Document Summary

Chapter 6: sensation and perception (part 2 of 4) Additive colour mixing (when seeing light): adding primary colours (red, green, blue) creates other colours; all colours overlapping creates white (white part is where all colours are reflected) Subtractive colour mixing (when seeing objects): mixing primary paint (red, yellow, blue) to create other colours; the darker the colours that are mixed, the closer to black the resulting colour is (black surfaces reflect no light) Trichromatic theory: first theory of colour vision, 3 types of cones are sensitive to different wavelengths of light. Sex-linked to x chromosomes (so mostly affects males) But, these people can see yellow, even though yellow light is a combination of red and green . 2 cones: vertebrates such as dogs, cats, horses, pigs, etc. (are all red-green colour blind) 4 cones: many birds, some non-mammalian vertebrates. Up to 12 cones: in some invertebrates like insects (other intevertebrates mostly 3 cones)