What is described as the physiological foundation for psychotherapy?

• A. Behavioral theory is primary.
• B. Humanistic therapy is primary.
• C. Biopsychological research links biological systems to behavior.
• D. Psychoanalytic theory is primary.

Answer: (C)

The idea being tested is that biology and brain processes form the physical basis for how psychotherapy works. Biopsychological research links biological systems to behavior, capturing how neural circuits, neurotransmitters, and stress responses underlie thoughts, emotions, and actions, and how therapy can modulate these biological processes to promote change. This fits with the biopsychosocial approach, which recognizes that mental health involves the interplay of biology with psychological and social factors. The other options describe particular therapeutic orientations—behavioral, humanistic, or psychoanalytic—which explain therapeutic aims or methods but do not identify the physiological foundations that underlie mental processes and treatment mechanisms.