perception of colour

Question 1

How do we see colour?

Answer 1

RED GREEN BLUE

the retina has 3 types of cones responsible for colour vision

Question 2

colour perception and the retina-

Answer 2

The retina contains rods and cones

rods= low light conditions and there are only one type

cones= respond to red green and blue (so 3 cones)

• when we see a colour each cone sends its own distinct signal to the brain

when ist dark- rod cells take over, which is why we cant see colour- it is just light or no light signals that are sent to the brain

Question 3

what is trichromatic coding?

Answer 3

explains the coding of red blue and green lgiht from cones.

Color blindness= confusion between red and green (10% of males)- red cones get filed with green pigment of vice versa.

Question 4

what is opponent process coding

Answer 4

involves ganglion cells

colour sensitive ganglion cells respond to colour pairs e.g. yellow pairs with blue/ red pairs with green

Question 5

what is negative after image?

Answer 5

occurs to adaption of the rate of firing from the ganglion cells

if ganglion cells are cited/inhibited for a prolonged time they will fire more/less relative to baseline activity causing a rebound effect

you see the colour that is complementary to the one infornt of you

Question 6

colour blindess=

Answer 6

carried on the X chromosome which is why it is more common in males