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The following outline is provided as an overview of and topical guide to abnormal psychology: Abnormal psychology – is the scientific study of abnormal behavior in order to describe, predict, explain, and change abnormal patterns of functioning. Abnormal psychology in clinical psychology studies the nature of psychopathology, its causes, and its treatments. Of course, the definition of what constitutes 'abnormal' has varied across time and across cultures. Individuals also vary in what they regard as normal or abnormal behavior. Additionally, many current theories and approaches are held by psychologists, including biological, psychological, behavioral, humanistic, existential, and sociocultural. In general, abnormal psychology can be described as an area of psychology that studies people