Long-term memory is like a computer's hard drive, a fairly permanent storehouse of programs and data

An overwhelming desire to set fires is called a/an:

a. obsession. b. phobia. c. compulsion. d. somatoform.

A psychologist is investigating the study behavior of college students. She writes a list that includes the following: underlining versus not underlining, studying in a quiet room versus studying in a noisy room

and studying alone versus studying with a group of students. Which term best describes the items on this list? a) control variables b) dependent variables c) extraneous variables d) independent variables