c. it can be perceived in one way only
d. it does not meet the criterion of subjectivity- The Moon illusion
a. is caused by large changes in the Moon’s distance from the Earth
b. provides a good example of size constancy
c. provides a case in which size constancy breaks down
d. violates figure-ground perception - The principal depth perception cue associated with binocular vision is
a. linear perspective
b. texture gradient
c. motion parallax
d. retinal disparity - One of the following is nota kind of extrasensory perception.
a. Psychokinesis
b. Precognition
c. Telepathy
d. Clairvoyance - What is the status of psi powers in psychology as a science?
a. Psi powers are proven facts
b. No one has done experiments on psi powers
c. The reality of psi powers is still open to question
d. Telepathy is real, but clairvoyance is not
ANSWERS TO THE SELF-TEST1-b 2-d 3-c 4-a 5-d 6-b 7-c 8-d 9-a 10-cANSWERS TO THE TRUE-OR-FALSE PREVIEW QUIZ- True.
- False. Figure-ground perception is sometimes unstable and reversible (e.g., the vase-
faces illusion). - True.
- False. For example, learning often sharpens our perception.
- False. Clairvoyance is the power to “see” something out of the normal range of vision.
Psychokinesis is the power to move objects using only energy transmitted by the mind.
70 PSYCHOLOGY