According to his website: "Dr. Ross is an internationally renowned clinician, researcher, author and lecturer in the field of dissociation and trauma-related disorders. He is the founder and President of the Colin A. Ross Institute for Psychological Trauma."
And, "In addition, Dr. Ross has authored over 130 professional papers, has reviewed for numerous professional journals and grant agencies and is a past President of the International Society for the Study of Trauma and Dissociation." Dr. Ross has even acted as a consultant for the Showtime television series The United States of Tara about a troubled housewife who suffers from a case of the mythic Multiple Personality Personality Disorder (MPD), now known as Dissociative Identity Disorder (DID)...

The victim who represses memories thus then develops "distinct identities or personality types" of which they also aren't consciously aware, but which "recurrently take control of the person's behavior".
It is these alternate identities that retain the traumatic memories for the victim. Treatment for this condition often relies on the recovery of these repressed traumatic memories. The victim, it is presumed, must confront these hidden traumas so as to assimilate them into the conscious mind, thereby making the mind "whole" again....
www.examiner.com