Neuropsychologists and psychobiologists investigate the relationship between physical (body) systems and behavior. These psychologists may study chemical and physical changes that occur in the body when one experiences different emotions. Or they may study the effect of specific biochemical mechanisms in the brain to behavior, and the relation of brain structure to function. Neuropsychologists may also diagnose and treat disorders related to the central nervous system. These psychologists work in academic settings where they conduct research and train others. They might also work in hospitals and clinics.