[Evaluation of the role of the adaptive result in the theory of the functional systems].

The fundamental of the theory of the functional systems, i.e., the concept of the useful adaptive result as a universal system-forming factor is considered. It is suggested that the adaptive result is not system-forming in behaviors actualized exclusively due to activity of systems developed earlier. It is argued that positive mutations may serve as the system-forming factor for hereditary determined behavioral forms. In all other cases of goal-directed behavior (except conditioning) the aim of performance as a model of the future result plays the decisive role. Only in conditioning the classical concept of the system-forming role of the adaptive result seems to be undeniable. The refined ideas about the mechanisms of formation of the functional systems may be useful in analysis of a number of animal and human functions (learning, emotional stress, neuroses, etc.).