Reminds me of one cultural interaction - patients from western cultures tend to have far more negative and evil voices perhaps related to more Judeo Christian possesion by demons cultural baggage and descendant myths like "slasher who kills because the voices tell him to" (which defense attorney strategy cases aside are ironically real manifestationd of the culture bound delusion).

Interestingly those other cases tend to be more positive or neutral despite other posession myths in the host culture.

I guess anxiety and paranoia makes the "demons" whatever is believeable to the cultural zeitgeist.