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This updated fifth edition includes over 700 articles. All entries have been reviewed by our team of medical experts to ensure that the most up-to-date information on disorders, treatments, drugs, and therapies are included. Dozens of new entries have also been added to the set. Essays range from one to eight pages each and address how culture, ethnicity, and gender affect psychological theory and beliefs. This five-volume encyclopedia covers the history of psychology as an experimental and social science, as an applied health discipline, as a profession, and as a locus for the panoply of preeminent contributors in the field. This volume discusses behaviorism, cognition, perception, cognitive behavioral psychology, psychodynamic psychology, object relations theory, family systems therapy, Gestalt therapy, the biological bases of human behavior, sexuality, personality theory, and comparative therapies of treatment.