I read a story on that in the media last year which was interesting. I seem to recall people from India, for example, didn’t have the same kind of rage voices in their heads as people get more often in the West.
Of course, the same article pointed out (which I had also read elsewhere) that the incidence of auditory hallucination as an acute thing (not chronic) was actually pretty high in the general population. People just don’t mention it to others for fear of sounding crazy.
Updated:
http://news.stanford.edu/news/2014/july/voices-culture-luhrmann-071614.html
https://www.sciencenews.org/article/hallucinated-voices’-attitudes-vary-culture
