B. On the nature of the unconscious factor. Two categories--static unconscious, dynamic unconscious.--Theories as to the nature of the unconscious.--Objections, criticisms. 338 C. Cosmic and human imagination. 346 D. Evidence in regard to musical imagination. 350 E. The imaginative type and association of ideas. 353 INTRODUCTION INTRODUCTION THE MOTOR NATURE OF THE CONSTRUCTIVE IMAGINATION I It has been often repeated that one of the principal conquests of contemporary psychology is the fact that it has firmly established the place and importance of movements; that it has especially through observation and experiment shown the representation of a movement to be a movement begun, a movement in the nascent state. Yet those who have most strenuously insisted on this proposition have hardly gone beyond the realm of the passive imagination; they have clung to facts of pure reproduction. My aim is to extend their formula, and to show that it explains, in large measure at least, the origin of the creative imagination. Let us follow step by step the passage from reproduction pure and simple to the creative stage, showing therein the persistence and preponderance of the motor element in proportion as we rise from mere repetition to invention. First of all, do all representations include motor elements? Yes, I say, because every perception presupposes movements to some extent, and representations are the remnants of past perceptions. Certain it is that, without our examining the question in detail, this statement holds good for the great majority of cases. So far as visual and tactile images are concerned there is no possible doubt as to the importance of the motor elements that enter into their composition. The eye is very poorly endowed with movements for its office as a higher sense-organ; but if we take into account its intimate connection with the vocal organs, so rich in capacity for motor combinations, we note a kind of compensation. Smell and taste, secondary in human psychology, rise to a very high rank indeed among many animals, and the olfactory apparatus thus obtains with them a complexity of movements proportionate to its importance, and one that at times approaches that of sight. There yet remains the group of internal sensations that might cause discussion. Setting aside the fact that the vague impressions bound up with chemical changes within the tissues are scarcely factors in representation, we find that the sensations resulting from changes in respiration, circulation, and digestion are not lacking in motor elements. The mere fact that, in some persons, vomiting, hiccoughs, micturition, etc., can be caused by perceptions of sight or of hearing proves that representations of this character have a tendency to become translated into acts.