Caruth (1996) concisely defines trauma in terms of an experience that is registered but not experienced, a truth or reality that is not available to the survivor as a standard experience. The person (for example) was factually, objectively present when the head on collision occurred, but, even if the person has memories, and would acknowledge the event, paradoxically, the person does not presently experience it as something the person experienced in a way that a person standardly experienced the past event. The survivor experiences dissociated, repetitive nightmares, flashbacks, and depersonalization.