In Papousek's conditioning of infants to turn their heads to a buzzer or a bell to receive milk, he found that the earlier training began, the younger the infants were when they mastered the task

Inhalant use has traditionally been more common among

A. poor Hispanic and Native American youth. B. middle-class white children. C. middle-class black children. D. construction workers.

As objects that are familiar move further away, you continue to perceive them as being about the same size. This is known as __________

a) size continuity. b) size proximity. c) size constancy. d) size similarity.