In an experiment, a researcher manipulates one variable to see how it affects a second variable. The second variable, which is observed for any possible effects, is called the __________

One neurotransmitter that is universally affected b drugs of abuse is ______

a. Serotonin b. Dopamine c. MDMA d. Gamma Aminobutyric Acid

Moses is getting old. Which of the following is most likely to remain stable and not decline in the near future??

a. ?working memory span b. ?processing speed c. ?fluid intelligence d. ?vocabulary

According to the concept of imprinting,

a. if it gives contact comfort, it must be mother. b. if it moves, it must be mother. c. if it feeds me, it must be mother. d. if it is a member of my own species, it must be mother.

What aspect of circadian rhythms might explain why we tend to feel so tired at night?

a) Body temperature bottoms out on Monday mornings. b) The three biorhythm patterns converge at low points on Mondays. c) Heart rates typically increase at night. d) There is an organ in the brain sensitive to light changes, which then affects our sleepiness.