mentally derived principles of learning to the treatment of psychological disorders. The concept derives primarily from work of Russian psychologist Ivan Pavlov. Behavior-therapy techniques differ from psychiatric methods, particularly psychoanalysis, in that they are predominately symptom (behavior) oriented and shows little or no concern for unconscious processes, achieving new insight, or effecting fundamental personality change. The U.S. psychologist B.F. Skinner, who worked with mental patients in a Massachusetts State hospital, popularized behavior therapy. From his work in animal learning, Skinner found that the establishment and extinction of responses can be determined by the way reinforces, or rewards, are given. The pattern of reward giving, both in time and frequency, is known as a schedule of reinforcement. The gradual change in behavior in approximation of the desired result is known as shaping. More recent developments in behavior therapy emphasize the adaptive nature of cognitive processes. Behavior-therapy techniques have been applied with some success to such disturbances as enuresis (bed-wetting), tics, phobias, stuttering, obsessive-compulsive behavior, drug addiction, neurotic behaviors of normal persons, and some psychotic conditions. It has also been used in training the mentally retarded. Collective Behavior much of collective behavior is dramatic, unpredictable and frightening, so the early theories and many contemporary popular views are more evaluative than analytic. The French social psychologist Gustave Le Bon identified the crowd and revolutionary movements with the excesses of the French Revolution; the U.S. psychologist Boris Sidis was impressed with the resemblance of crowd behavior to mental disorder. Many of these early theories depicted collective behavior returned to an earlier stage of development. Freud retained this emphasis in viewing crowd behavior and many other forms of collective behavior as regressions to an earlier stage of childhood development; he explained, for example, the slavish identification that followers have

Some topics in this essay:
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