Amphetamine-induced stereotyped behavior is a nonsteady oscillatory process. In its structure waves with 2-3, 4-5 and 10-15 minute periods may be distinguished. In some animals (30%) after chronic amphetamine administration the stereotyped behavior was attenuated with reorganization of its rhythmical pattern but in other cases (35%) stereotype on the contrary increased. Tolerance developed in the animals which had initially the more pronounced stereotype with the predomination of short-period (2-3 min) waves on the chronogram. These animals demonstrated low locomotor activity in the opened field, greater immobility in the forced swimming test and better relearning in Y-maze.