The study of sleep was aided by the development of the ______ .

In experimental research, the variable that the researcher measures because it is thought to be affected by the manipulation of another variable is the

a. extraneous variable. b. dependent variable. c. independent variable. d. controlled variable.

Drives are:

a. internal states that push an individual toward behaving in a certain way b. external factors that pull an individual toward behaving in a certain way c. internal states that pull an individual toward behaving in a certain way d. external factors that push an individual toward behaving in a certain way