"In your research, you must have discovered that dissociative identity disorder, and other dissociative disorders, develop as a reaction to trauma." Cuddy kept her voice calm and even. Not quite mirroring his monotone, she was hoping to help him feel safer. The hospital staff speaking to his father and not to him, gave her an idea of how he might have been treated there - with little say in his own treatment. "The mind creates alternate personalities as a coping mechanism."
Cuddy stopped for a moment, giving him the chance to react, and watching to see if he agreed or disagreed. If the Marc personality didn't remember the trauma, this could be difficult. "As your doctor, my largest concern is how this disorder is impacting your functioning in everyday life. I know about your difficulty sleeping. What other problems are you having?"