Colour perception
- Created by: Anj_
- Created on: 13-05-15 19:19
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- Visual and Auditory Perception
- SUMNER & MOLLOM (2003): colour perception
- humans developed the ability to survive - evolution
- had to learn which berries were poisonous through their colour
- humans developed the ability to survive - evolution
- colour is a psychological reaction to wavelengths
- only exists in the mind
- everything is black but light waves add colour which our mind interprets
- electromagnetic spectrum - A continuous range of wavelengths
- waves on visible spectrum under the eye
- layers of cells in the eye process hue, saturation and lightness
- objects appear white when reflecting all of the spectrum wavelengths
- the sun/a lightbulb
- objects appear black if they are absorbing all of the spectrum wavelengths
- which is why when all lights are switched off everything is black - natural colour
- humans see range of colours from violet to red
- dogs are limited and only see from greys, blues and yellows
- waves on visible spectrum under the eye
- Cones - specialised cells in the eye which allow us to see in colour
- trichromats - those that possess 3 types of cones
- short wave cone, middle wave cone, long wave cone - all sensitive to a different wavelength
- humans
- tetrachromats - those that possess 4 types of cones
- tropical fish/ birds/some females
- pigeons however are pentachromat- possess 5 cones
- tropical fish/ birds/some females
- trichromats - those that possess 3 types of cones
- colour constancy - a human ability to take into account the colour of the light source
- mentally subtract the colour of the light shining on it
- take away artificial light or imagine it is in a shadow
- HERING (1920): Opponent- Process Theory
- Process colours in pairs of opponents
- black - white red - green yellow - blue
- abnormal colour processing causes abnormal colour vision
- colour blindness
- adjust colours in pairs based on how much light we think is shining
- Process colours in pairs of opponents
- SUMNER & MOLLOM (2003): colour perception
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