Cognitive behavior therapy evolved from two lines of clinical and research activity. First, it derives from the work of the early cognitive therapists (Albert Ellis and Aaron Beck); second, it was strongly influenced by the careful empirical work of the early behaviorists.
Within the domain of behaviorism, cognitive processes were not always seen as a legitimate focus of attention. In behavior therapy, there has always been a strong commitment to an applied science of clinical treatment. In the behavior therapy of the 1950's and 1960's, this emphasis on scientific methods and procedures meant that behavior therapists focused on events that were directly observable and measurable. Within this framework, behavior was seen as a function of external stimuli which determined or were reliably associated with observable responses. Also during this period, there was a deliberate avoidance of such "nebulous" concepts as thoughts, cogni tions, or images. It was believed that these processes were by their very nature vague, and one could never be confident that one was reliably observing or measuring these processes.
By following scientific principles, researchers developed major new treatment approaches which in many ways revolutionized clinical practice (among them are systematic desensitization and the use of a token economy). During the 1960's, however, several developments within behavior therapy had emphasized the limitations ofa strict conditioning model to understanding human behavior.
In 1969, psychologist Albert Bandura published his influential volume Principles of Behavior Modification. In this book, Bandura emphasized the role of internal or cognitive factors in the causation and maintenance of behavior. Following from the dissatisfaction of the radical behavioral approaches to understanding complex human behavior and the publication of Ban-dura's 1969 volume, behavior therapists began actively to seek and study the role of cognitive processes in human behavior.
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