The Biological Perspective The physiological aspects of behavior and mental processes are studied by biological psychologists. Psychologists and other scientists who specialize in the study of the brain and the rest of the nervous system are called neuroscientists. Here, Swiss neuroscientist Juliane Britz uses a device called an electroencephalogram to monitor brain wave activity in a research participant. Dr. Britz studies the brain processes involved in sensation, perception, and awareness (Britz & others, 2014).