There are two levels of processing involved in color vision. The first occurs in the retina and the second in the ganglion cells and in neurons in the brain. Identify and explain the theory associated with each level
What will be an ideal response?
Answer: A good answer will include the following key points.
• The first level of processing occurs in the retina and is explained by the trichromatic theory.
• The retina contains three types of cones, each of which responds to a different range of wavelength (blues, greens, and reds).
• The colors we see result from the combined activity of these three types of cones.
• The second level of processing occurs in ganglion cells and neurons in the brain and is explained by the opponent-process theory.
• Opponent-process cells respond in opposite fashion (excitation or inhibition) to either red and green or blue and yellow.
• This color code is passed on to higher visual centers.
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