A man states, without any qualification and with full conviction, that he is genuinely two separate people who happen to share one body, each with a distinct name, history, and way of speaking. Before revealing the answer: is this best described as disturbance of self-unity?

This has moved beyond the milder form of disturbance of self-unity into its more severe end, or arguably into multiple personality experience itself. The loss of the qualifying 'as if' — his full, unqualified conviction that he genuinely is two people — marks the more severe form of disturbance of self-unity. The additional detail of distinct, separately experienced identities each with their own name and history is characteristic of multiple personality experience specifically, which represents the most severe and specific form along this spectrum. Which label best fits should be guided by exactly how distinct and separately elaborated the two identities are, not simply by the presence of a 'two people' complaint.