Biopsychology
Biopsychology is a branch of psychology that focuses on how the physiology and biology of the body impact behavior, thoughts, and feelings. Topics in biopsychology include the nervous system, endocrine system, fight-or-flight response, localization of function in the brain, plasticity and functional recovery of the brain, methods of studying the brain, and biological rhythms such as endogenous pacemakers and exogenous zeitgebers. This field explores the intricate relationship between the biological processes of the body and psychological phenomena.