ABSTRACT
Among the psychological factors determining human behaviour, the instincts are the chief motivating forces of psychic events. The separation of psychology from the basic assumptions of biology is purely artificial, because the human psyche lives in indissoluble union with the body. The dynamic factors determining human behaviour is obviously incomplete without mention of the will. Reflexio means 'bending back' and, used psychologically, would denote the fact that the reflex which carries the stimulus over into its instinctive discharge is interfered with by psychization. Anatomical masculinity, for instance, is far from being proof of the psychic masculinity of the individual. Mythological research designates them as 'motifs', to Levy-Bruhl they are representations collectives, Hubert and Mauss call them 'categories of the imagination'. It is that of William James, whose psychological vision and pragmatic philosophy have on more than one occasion.
