Despite recent advances, dissociation remains, in the words of one authority “an elusive concept….vague, confusing, and even controversial” (Dell, 2009, p.225). It is found in about 30% of psychiatric inpatients but is typically unrecognized. The aim of this talk to clarify the concept using current research data, including those generated on this campus. The discussion is woven about the distinction between “primary” and “secondary dissociation,” the former having the cardinal characteristics of psychic, neural and interpersonal disconnectedness.