Sandra stares for about 30 seconds at a green square. After 30 seconds, she looks at a white sheet of paper. What will she "see"?
A) a red square
B) a blue square
C) a yellow square
D) a green square
Answer: A
Rationale: According to the opponent-process theory, we perceive color in terms of opposite ends of the spectrum: red to green, yellow to blue, and white to black. This can be demonstrated by the phenomenon of negative afterimages, where we briefly see the opponent color after the first color is removed. In this example, the opponent color of green is red, so Sandra will see a red afterimage.
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