How does the dual-process theory of colour vision combine the trichromatic and opponent-progress theory?
a. Each of the receptors can function in two possible ways, depending on the wavelength of the stimulus. The pattern of activity in the receptors yields our perception of the hue. 18. What are the two major types of colour blindness? How are thy tested? a. Colour blindness is caused by a deficiency in the red-green, yellow-blue, or both system. b. Tests of colour-blindness contain sets of coloured dots. Depending on the type of deficit, a colour-blind person cannot recognize certain numbers embedded in the circles. 19. What kinds of feature detectors exist in the visual system? What is meant by parallel processing of sensory information? a. Groups of neurons within the primary visual cortex are organized to receive and integrate sensory nerve impulses originating in specific regions of the retina. b. One neuron may fire frequently when a horizontal line is detected while a different neuron may only fire when it detects a vertical line. c. When a red, white, and green beach ball sails t
