One possible definition of shamanism is that it is the disciplined approach to what has been variously called "non-ordinary reality", "the sacred", "the mystery", "the supernatural", "the inner world(s)", or "the otherworld".
Psychologically speaking, one could say these expressions refer to realms of consciousness that lie outside the boundaries of our usual and ordinary perception. The depth psychologies derived from psychoanalysis refer to such normally inaccessible realms as "the unconscious", or "the collective unconscious". This would, however, be too limiting a definition for shamanism, if "unconscious" is taken to refer to something within the individual, i.e. intrapsychic. Shamanic practice involves the exploration not only of unknown aspects of our own psyche, but also the unknown aspects of the world around us, - the external as well as internal mysteries.
There are three traditional systems of consciousness... (Click title for more)