It compares experiences of people from few cultures or subcultures where plurality is central in the beliefs of the culture, including tulpamancy, mediumship and Evangelical Christianity. It considers them with a psychosis in mind, later coming to the conclusion that some things treated as features of psychosis are in fact features of the thought itself (as we understand it: hearing voices may be a normal part of human experience and it's not necessarily a sign of mental ilness), but also mentiones the possibility that the spirits in these cultures may sometimes temporarily control the body (definitely a plural trait), which in some of them is perceived as good, but in others as bad and is discouraged. And according to this only some of these people hear voices before becoming involved in the culture's practices (they doesn't mention dissociative disorders whatsoever, but some of these cases could be systems with DID/OSDD interpreting their alters in their religious context), the rest of them has to actively learn to do it through techniques characteristic to that culture, which in general often involve some kind of meditation and speaking to the spirits as they were physically present, and with the guidance of the elders or more experienced practitioners.
We've found this one on spiritual plurality: https://www.researchgate.net/publication/368815645_Learning_to_Discern_the_Voices_of_Gods_Spirits_Tulpas_and_the_Dead
It compares experiences of people from few cultures or subcultures where plurality is central in the beliefs of the culture, including tulpamancy, mediumship and Evangelical Christianity. It considers them with a psychosis in mind, later coming to the conclusion that some things treated as features of psychosis are in fact features of the thought itself (as we understand it: hearing voices may be a normal part of human experience and it's not necessarily a sign of mental ilness), but also mentiones the possibility that the spirits in these cultures may sometimes temporarily control the body (definitely a plural trait), which in some of them is perceived as good, but in others as bad and is discouraged. And according to this only some of these people hear voices before becoming involved in the culture's practices (they doesn't mention dissociative disorders whatsoever, but some of these cases could be systems with DID/OSDD interpreting their alters in their religious context), the rest of them has to actively learn to do it through techniques characteristic to that culture, which in general often involve some kind of meditation and speaking to the spirits as they were physically present, and with the guidance of the elders or more experienced practitioners.