Psychology is the scientific study of the mind and behavior. It aims to understand how and why individuals think, behave and feel the way they do. The discipline involves studying various aspects including perception, cognition, emotion, personality, behavior and interpersonal relationships, and it can also involve exploring the physiological and biological processes that underlie cognitive functions and behaviors. Psychologists employ a range of techniques to investigate complex mental and behavioral systems, including psychological experiments, psychoanalysis, neuroimaging studies, psychotherapy and counseling.