With his puzzle box experiments, Thorndike discovered that learning is usually a(n) _____ process

Identity that is incoherent, disjointed, and characterized by an incomplete sense of self is called:

A. false-self behavior. B. moratorium. C. identity diffusion. D. marginal identity.

In a study of the effectiveness of a treatment for depression, a psychologist assessed patients' symptoms of depression using a reliable questionnaire both before and for several months after treatment. The results indicated that the patients experienced a decrease in their symptoms over the 8-month time period of the study. One threat to internal validity the researcher should consider is

A. maturation. B. regression. C. testing. D. all of these