Dr. Daniels spoke with several members of the family in order to obtain developmental information about the problems being experienced by his adolescent client. This best exemplifies a(n)____ interview

Which method is dependent upon injecting a radioactive chemical into the blood to measure blood flow?

a. fMRI b. PET c. CAT d. magnetic stimulation

As part of an experimental study on neuropeptides and their effect on emotions, Hilda administers a certain chemical to a group of teenagers, which has been chosen as the sample. The effects of this chemical include a feeling of elation and a need for affiliation. The group of teenagers considered for research exhibits a need to socialize more with the people on campus. Which of the following is the group of teenagers likely to have been given?

A. Melanin B. Ghrelin C. Lutein D. Oxytocin