Hi Michael, great talk! You nicely contrasted tulpamancy with DID. May also be interesting to also contrast tulpamancy with psychogenic amnesia, where there isn't necessarily any psychosis or other problems, and it can be somehow adaptive, like switching to a different, new self without the former autobiographical history, opening up new opportunities. Just not done intentionally (or at least not 100% intentionally, because we call that by a different name, feigned amnesia). Another comparison point is a lucid dream guide. This can be also be like an invisible being, conjured to accompany you during your lucid dream, a helpful companion. Some people have them - though there is also a sense in which every other being populating your dream is another sort of self, created in the same way that your normal self is created, so those beings are also like tulpas in some ways, just only during sleep. Also some parallels in Native-American practices that I bet you already know about. One last comment - the Alien Hand Syndrome is a fascinating neuropsychological occurrence (I have some video) and it has been ascribed to SMA damage so fits nicely with what you described around your SMA findings.