An echo usually stays in the sensory registers for about ______

Pavlov's research on digestion demonstrated

a. the utility of electric shock as a stimulus. b. that animals can learn to respond to a previously neutral stimulus. c. that hunger is a more powerful drive than thirst. d. that digestion begins in the mouth when the food is mixed with saliva. e. the power of experimental ablation in research.

A theory of perception that holds that the way we see the world is determined strictly

by the features of things in the world is called a _____ approach. (a) bottom-up (b) top-down (c) hypnopompic (d) Gestalt