In a research study, one-third of the subjects were injected with adrenaline, one-third were given a tranquilizer, and one-third were injected with a placebo (salt water) and shown a slapstick comedy film. The findings of the study provided support for Schachter's theory of emotion since the group members that laughed the MOST were the ones injected with

A type of research that involves using naturally-occurring changes as a sort of

independent variable is called a (a) correlational study (b) quasi-experiment (c) computer simulation (d) true experiment

Studies have found that students who learn to speak two languages will have

a. a lack of mental flexibility. b. weaker general language skills. c. better control of their attention. d. poor problem-solving abilities.