Color Perception Theories

  • Opponent-Process Theory (Hering):
    • Proposes four color receptor cones grouped in complementary pairs: red-green and blue-yellow.
    • Visual system cells respond by being excited by one color and inhibited by its opponent (e.g., red excites, green inhibits).
    • Explains afterimages: prolonged exposure to one color (e.g., red) fatigues its system, causing a rebound to the opponent color (green) when looking away.
  • Trichromatic Theory (Young and Helmholtz):
    • States there are three types of cone receptors sensitive to red, green, and blue light.
  • Reconciliation of Theories:
    • Both theories are correct and operate simultaneously.
    • Red, blue, and green cones in the retina connect to retinal ganglion cells, which convert the three-color input into the opponent-process code.
    • The eye and brain utilize both mechanisms for color coding.