Colour perception

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  • 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
    • 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
    • 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
    • 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


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