Nicotine creates pleasurable feelings by causing the release of ______

Tonia is two and is getting more independent. She can eat with a spoon and fork, she can pull her clothes on and off, and she is starting to color within the lines. These skills all compromise:

a. cephalocaudal development b. proximodistal development c. gross motor skill development. d. fine motor skill development.

If you hold a round plate in your hand and turn it from side to side, the image it casts on your retina changes. Yet you still perceive the plate to be round. This phenomenon can be explained by the principle of

a. brightness constancy. b. shape constancy c. size constancy. d. retinal disparity. e. binocular constancy.