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Psychology (from Greek: ψυχή, psukhē, "spirit, soul"; and λόγος, logos, "knowledge") is an academic/ applied discipline involving the scientific study of mental processes and behavior. Psychologists study such phenomena as perception, cognition, emotion, personality, behavior, and interpersonal relationships. Psychology also refers to the application of such knowledge to various spheres of human activity, including problems of individuals' daily lives and the treatment of mental health problems.