A psychotherapist tries to get her depressed client to understand the logical process he uses when coming to the conclusion that he is a worthless person. This psychologist probably is an advocate of which approach to psychotherapy?

The best way to eliminated potential confounds that might result from participant assignment is:

a. counterbalancing. b. randomization. c. elimination. d. equating.

Positron emission tomography (PET) assesses the metabolic activity of

a. the brain, through measuring changes of blood flow. b. glucose or oxygen in the brain, by following the path of a radioactive tracer injected intravenously. c. the diffusion of water in the brain tissue, permitting the imaging of the white matter tracts. d. brain tissue after exposure to a strong magnetic field.