is the study of how physiological processes in the body (neural activity, hormone secretion, balance of neurotransmitters and regulation of the autonomic nervous system) affect the psychological state of a person, and vice versa. While psychophysiology focuses on understanding the biological mechanisms involved in behavior and emotion, psychosomatics uses these findings to explain the direct effects of anxiety, anger, or depression on the body’s cardiovascular, digestive, and immune systems. For example, psychophyisology demonstrates how hyperactivity of the sympathetic nervous system leads to high blood pressure and heart palpitations, which are important for understanding the link between stress and cardiovascular disease. Thus, psychophyisology forms the basis that provides psychosomatics with precise biological mechanisms that explain the interaction of the psyche and the body.