3 - Colour Perception Flashcards
What is human trichromacy? (Colour Cognitive)
Three cone types, maximally sensitive at short (s), medium (m) and long (l) wave lengths
What cone lengths occur at ultraviolet light? (Colour Cognitive)
Short cone
What cone lengths occur at visible light? (Colour Cognitive)
Middle cone
What cone lengths occur at infrared light? (Colour Cognitive)
Long cone
What are primates generally seen as? (Colour Cognitive)
Dichromatic (two cones)
What are humans seen as? (Colour Cognitive)
Trichromatic (three cones)
What colour types does dichromatic detect? (Colour Cognitive)
- Blue
- Yellow
What colour types does trichromatic detect? (Colour Cognitive)
Blue and yellow split to red and green
What does a monochromat experience? (Colour Cognitive)
No colour vision
What three types of dichromate are there and what do they lack? (Colour Cognitive)
- Protanopia = red cone (l)
- Deuteranopia = green cone (m)
- Tritanopia = blue cone (s)
What is a anomalous trichromat? (Colour Cognitive)
Someone who has an shortened/alteration in all 3 cones
What is human tetrachromacy? (Colour Cognitive)
4 cones are present
What is cone opponency? (Colour Cognitive)
Mechanism by which we do early processing of colour signalling
What does a change in colour from red to green signify? (Colour Cognitive)
long wavelength to medium wavelength
What does a change in colour from blue to yellow signify? (Colour Cognitive)
Short wavelength to long/medium wavelength
What does a change in colour from black to white signify? (Colour Cognitive)
Long wavelength to medium wavelength
In the lateral geniculate nucleus, what colours does the parvaocellular pathway represent? What does a change in colour from red to green signify? (Colour Cognitive)
Red to green
In the lateral geniculate nucleus, what colours does the koniocellular pathway represent? What does a change in colour from red to green signify? (Colour Cognitive)
Yellow to blue
In the lateral geniculate nucleus, what colours does the magnocellular pathway represent? What does a change in colour from red to green signify? (Colour Cognitive)
Black to white
What is cerebral chromatopsia? (Colour Cognitive)
Complete loss of colour vision, occurring through damage to the cortical region
What is colour constancy? (Colour Cognitive)
A feature that ensures the perceived colour of objects remain constant under caring illumination conditions
