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Hans Selye (1907- 1982) was a Hungarian endocrinologist, first to give a scientific explanation for biological stress. Hans Selye explained his stress model based on physiology and psychobiology as General Adaptation Syndrome (GAS).His model states that an event that threatens an organismâs well-being (a stressor) leads to a three-stage bodily response: Stage 1: Alarm.onclusion. Hans Selye's theory profoundly influenced the scientific study of stress. Stress is a state produced by a change in the environment and the nature of the stressor is variable.
Harry F. Harlow was an American Psychologist who provided a new understanding of human behavior and development through studies of social behavior of monkeys. His research contributions (in the areas of learning, motivation, and affection) have major relevance for general and child psychology.