Trauma, in turn, creates a regressed portion of the ego which fails to participate in the mental development of other parts of the self... they are revived by analogous threatening conditions, and they amplify the current distress, flooding the ego with the disorganizing anxiety of the early trauma.
Odier's model, as Kalsched presents it, identifies trauma as the direct generator of a split-off, developmentally arrested ego-portion that is reactivated by later distress and floods the whole ego with archaic, disorganizing anxiety.
, The Inner World of Trauma: Archetypal Defences of the Personal Spirit, 1996thesis