Regenerative dissonance

Regenerative dissonance was a mental illness seen in Time Lords. It occurred when the personalities of a Time Lord's previous incarnations lived on inside the body of their current incarnation, exerting just as much influence on the body as the personality of the current incarnation. The eleventh incarnation of a Time Lord calling himself the Eleven suffered from this. His previous selves went by a number sequence in order of incarnations. (AUDIO: The Eleven)