Colour perception

Question 1

what is colour?

Answer 1

a sensation that allows us to discriminate two unstructured surfaces of equal luminace

Question 2

what is trichromatic theory?

Answer 2

colour perception is based on three main primary colours corresponding to three receptor types in the retina

Question 3

what is mixing paints?

Answer 3

subtractive colour mixing, removing light

Question 4

what is switching lights on?

Answer 4

adding light = additive colour mixing

Question 5

what was the evolution of colour vision ~500 million years ago?

Answer 5

rod opsin , s opsin and m/l opsin (only two differnetiated cones)

Question 6

what was evolution of colour vision ~50 million years ago?

Answer 6

rod opsin, s opsin, mopsin and l opsin ( 3 differentiated cones)

Question 7

what is trichromacy?

Answer 7

can see all colours

Question 8

what is dichromacy?

Answer 8

cannot see all colours, colour deficient

Question 9

three types of dichromacy and what they lack?

Answer 9

tritanopic= lost sopsin
deuteranopic= lost m opsin
protanopic = lost l opsin

Question 10

what is opponent processing theory?

Answer 10

colour perception is based on the activity of three opponent systmes

Question 11

whta are the 4 stages of colour vision?

Answer 11

three cone types, opponent processing, higher order mechnaisms and colour categories