Subjects were instructed to divide (during 4 sessions) into four groups cartoons made by four different artists. Efficient performance has been found to correlate with the ability to reveal and verbalize individual features of the artistic style. The latter in its turn correlates with such characteristics of the cognitive sphere as independence of the field and high development' of the second signal system (good development of the first signal system unsupported by a corresponding state of the second one fails to produce required performance). Some recommendations are made as to how general learning effects can be achieved by means of purposeful promotion of better cognitive differentiation.