S. L. Rubinstein's subjective-activity concept is compared to P. K. Anokhin's physiological functional system theory. There are common features in two concepts - recognition and examination of psychic and neurophysical regulation continuity - and differences - the evaluation of subject's role and goals, of feed-back as integrative factor in nervous and psychic activity. If physiological theory considers feed-back necessary and sufficient as a mechanism of self-regulation, for the subjective-activity concept it is necessary, but not sufficient, because the subject, using visual-active connections, forms higher level of self-regulation (theoretical thinking, freedom, etc. ). Visual-sensoric images on this higher level are not enough for the evaluation of adequacy of results but the subject himself considers not evident meaning of sensory-perceptive data.