Question : 21. As compared to women, color blindness _____ among men. A. less commonB. about : 1252691

21. As compared to women, color blindness is _____ among men. 
A. less common
B. about as common
C. five times less common
D. more common

22. In the most common form of color blindness: 
A. everything is seen in black and white.
B. blue and yellow cannot be distinguished.
C. all red and green objects appear yellow.
D. green objects appear red.

23. Damon is among the 7% of males with color blindness. He suffers from the most common form of color blindness. Which of the following statements best illustrates Damon’s experience of color? 
A. The blue sky and green grass appear to be the same color.
B. A pound of butter looks to be the same color as the blue dish on which it is resting.
C. Everything looks black, gray, or white.
D. Red apples on a tree seem to be yellow.

24. The _____ states that there are three kinds of cones in the retina, each of which responds primarily to a specific range of wavelengths. 
A. opponent-process theory
B. emission theory
C. trichromatic theory of color vision
D. visual perception theory

25. The trichromatic theory was first proposed by _____. The opponent-process theory was first proposed by _____. 
A. Thomas Young; Ewald Hering
B. Ewald Hering; Hermann von Helmholtz
C. Hermann von Helmholtz; Thomas Young
D. Thomas Young; Hermann von Helmholtz

26. According to the _____ of color vision, receptor cells are linked in pairs, working in opposition to each other. 
A. opponent-process theory
B. emission theory
C. trichromatic theory of color vision
D. visual perception theory

27. Which of the following is true of the opponent-process theory? 
A. According to the opponent-process theory, perception of color is influenced by the relative strength with which each of the three kinds of cones is activated.
B. The opponent-process theory suggests that in addition to black and white, there are four, rather than three, colors.
C. According to the opponent-process theory, the cells that respond to color operate independently, rather than in conjunction.
D. The opponent-process theory provides a weak explanation for afterimages.

28. Suppose you stare at an illustration of the American flag for a while, then glance at a blank white page. The red stripes look green when you glance at the blank page because: 
A. cones responsive to green light begin firing.
B. cones responsive to red light stop firing.
C. the receptor cells for the red component of the pairing become fatigued.
D. the receptor cells for the green component of the pairing begin to adapt.

29. With respect to the trichromatic and the opponent-process theories of color perception, which of the following statements is most accurate? 
A. The trichromatic theory has largely been discredited.
B. The opponent-process theory has largely been discredited.
C. Trichromatic process works within the retina itself; whereas opponent mechanisms operate both in the retina and at later stages of neuronal processing.
D. The opponent-process theory describes color processing early in the visual system; trichromatic theory describes color processing later on in the visual system.