Multiple personality, dissociation, and C.G. Jung's complex theory.

Jung's contributions to the study of 'dissociation' are outlined here for perhaps the first time. Jung is unique in recognising that the 'dissociability of the psyche' is a fundamental process that extends along the continuum from 'normal' mental functioning to 'abnormal' states. Dissociation is recognised by Jung as a universal and necessary psychic activity for the development of personality through the differentiation of functions. However, when the cohesion of consciousness is shattered by extreme childhood traumata, as it is in the development of multiple personality, this natural differentiation of function is intensified and the dissociative splits between autonomous forces in the psyche become more extreme. This increases the autonomy of these 'splinter psyches' from ego-consciousness and reveals their archetypal core. They then develop into the phenomenon of 'alternate personalities' in multiple personality. In a comparison of the major tenets of the complex theory with recent empirical research on multiple personality, it is demonstrated that essential characteristics of Jung's 'autonomous complexes' are congruent with the phenomenology of the 'alternate personalities' or 'personality states' of this disorder. This underscores the relevance of Jung's complex theory to present understanding of multiple personality. In addition, the phenomenon of multiple personality is, in turn, important for realising the central significance of dissociation in the complex theory and provides an excellent contemporary clinical example of the archetypal ground of the psyche.