What is a trichromatic visual system?
Having 3 types of cones, attuned to different light colours
Having 3 types of rods, attuned to different light colours
Having 3 types of cones, each attuned to three different light colours
Having 3 types of rods, each attuned to three different light colours
What is Hue?
Colour
Lightness/Darkness
How strong the colour is
How relative the colour is
What is brightness?
Lightness/darkness
What is saturation?
What is dichromatic colour vision?
Only having two functioning cones, e.g. in horses yellow-blue vision
Losing the functioning of one cone, e.g. losing s-cone
Only being able to perceive two colours
Only being able to distinguish light/dark shades
What is CIE chromaticity space?
A diagram that all colours can be placed on
A list of every single colour
A brain area that deals exclusively with colour
A term for the visual environment with regards to colour
A typical PC screen displays about (a) colours, whilst humans are estimated to be able to distinguish about (b) colours
17 million, 8 million
8 million, 17 million
1,700,000, 800,000
800,000, 1,700,000
Trichromatic colour theory: What did Young, Helmholz state about colour? (before it was backed up by physiology)?
We only need a few photoreceptors and can figure out any colour from their relative responses
We only need a few photorecpetors, which combined can make any colour
We need many photoreceptors and work out colours based on their relative responses
We need many photoreceptors each with it's own colour
Trichromatic Colour Theory: Outline Hering's Opponent-Process Theory
Primary colours are in opposing pairs, see colours in terms of how much of one extreme it is
All colours are in opposing pairs, see colours in terms of how much of one extreme it is
Primary colours are in opposing pairs, see colours in terms of how one pair relates to other pairs
All colours are in opposing pairs, see colours in terms of how one pair relates to other pairs
Why when looking at a pattern, do we see the image in the opposite colours when presented with a white screen?
We adapt to the colour presented, so the opposite colour is more strongly activated in relation
We adapt to the opposite colour, so the presented colour is more strongly activated in relation
The pupil absorbs the light of the original colours and reflect them back onto the white surface, and opposing colours are perceived to refraction
Our brain fill sin the gaps of what it thinks we should see, and because the presented colours have adapted, the opposing colours are the closest matched
No functioning cones leads to what?
No colour vision, poor acuity and uncomfortable daylight
No colour vision, better acuity and uncomfortable daylight
No colour vision, better acuity and uncomfortable twilight
No colour vision, poor acuity and uncomfortable twilight
People with one class of cone functioning are called (a), results of this are (b)
(a) Monochromats, (b) No colour vision
(a) Monochromats, (b) Daylight uncomfortable
(a) Dichromats, (b) No colour vision
(a) Dichromats, (b) Daylight uncomfortable
Dichromats (2 functioning cone types): What is protanopia?
Insensitive to long wavelengths
Malfunctioning of m cones
Malfunctioning of s cones
Malfunctioning of l cones
Dichromats (2 functioning cone types): What is deuteranopia?
Dichromats (2 functioning cone types): What is tritanopia?
Some females are thought to have 4 cones enabling them to see more colours. What are they called?
Tetrachromats
Quadrachromats
Biquadromats
Ditrichromats
