Colour

Question 1

Colour perception

Answer 1

It is pretty, helps us know when food is ripe, when to cross the road, find berries in a tree

Question 2

Key qualities

Answer 2

• Hue (colour)
• brightness (sunlight or candle)
• saturation

Question 3

Trichromatic theory

Answer 3

-There are blue, green and red cones that allow us to perceive colour. in colour matching experiments participants needed three wavelengths to match all wavelengths shown. Physiology – S, M, L cones identified

Question 4

Monochromatism

Answer 4

-Causes colour deficiency as there are no cones so grayscale is seen (colour blind)

Question 5

Dichromatism

Answer 5

-There are two cone types which allow colour perception, so range is limited meaning there is a colour deficient

Question 6

After images

Answer 6

• Green produces a red after image – And vice versa
• Yellow creates a blue afterimage – And vice versa.
• Suggesting colours are paired

Question 7

Opponent process theory

Answer 7

• Proposed an achromatic (black and white) and chromatic system (colour).
• Light triggers receptors (trichromatic - colour matching) which triggers the opponent cells (opponent process - after images) which sends signals to the brain

Question 8

Separate area of colour perception

Answer 8

-Cerebral achromatopsia – Lose ability to see colour suggests there is a specialised area, prosopagnosia also impacts perception of colour and form

Question 9

The sub types of vision

Answer 9

Color, motion and depth.