In ancient Greek, the word psyche meant soul or mind, and logos was the study of something. Psychology, as a field, has evolved into an academic and applied field focusing on the study of the mind and behavior. In the applied sense, psychology also refers to the use of the knowledge accumulated through that study to mental illness and behavioral analysis. Psychologists study mental processes and behavior of individuals, alone or in a group, not on the group itself. Wilhelm Wundt opened the first psychological laboratory in 1879.