Researchers are training pigeons to peck to receive food pellets when they see gratings but withhold their pecks to receive pellets when they see a uniform gray circle. This procedure will help the researchers determine
A. whether or not pigeons can see color.
B. whether or not pigeons have feature detectors.
C. how much contrast a grating must have before it looks different from the gray circle to a pigeon.
D. whether pigeons are intelligent enough to learn to peck one stimulus rather than another.
Answer: C
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Fill in the blank with correct word
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