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Psychiatric clients' perception of life changes.
Stress, as a concept, was first introduced in the scientific literature by Selye in 1936. The term tended to replace the concept of emotion to convey the idea that a person experiences pressure from living which requires biological and psychological adaptation. Operational definitions of the term are varied. Jaco regarded stress as "a force or stimulus . . . which provokes the individual organism to respond in a condition of disturbance." On the other hand, Selye simply defined stress as the nonspecific response of the body to any demand made upon it.