1. We often perceive a series of dots on a printed form as a "solid" line because of the Gestalt principle of
A. consistency
B. similarity
C. closure
D. symmetry
2. Imagine that biologists have discovered an animal that has eyes very similar to human eyes, but that the only receptor cells in the retina are rods; there are no cones. Based on what is known about human vision, you might expect that this animal would
A. have poor vision in low illumination
B. have no color vision
C. have poor peripheral vision
D. be able to detect extremely fine details
3. Which of the following does NOT belong with the others?
A. alcohol
B. cocaine
C. nicotine
D. amphetamines