Behavior therapists assume that both abnormal behavior and normal behavior are learned. thus, good behavior is maintained by and unwanted behavior can be eliminated by a. transference; resistance b. reinforcement; punishment c. aversive conditioning; desensitization d. ignoring it; contingency contracting

Martha participates in a research study in order to receive extra credit for her psychology class. when she arrives in the research office she is given a can of what looks and tastes like beer, but which actually contains no alcohol. in the adjoining room martha's classmate karen is also participating in the study. karen receives a can of alcoholic beer. if the experiment was designed to test the effects of alcohol on concentration, then who is exposed to the independent variable?