From what I've seen, voices depend upon biographical experience. But what is biographical experience after all? Family interactions, the oh-so-broad term "experiences", and yes, of course, local culture.
So, i dont know, its nice validation that the schizophrenic experience is something more than "bad biological/physiological functioning" dictating everything, other than that i dont see the value or use of this finding.
It's not exactly news, but it is confirmation that cultural attitudes shape the experience of the mentally ill, and that in the US we have a particularly harsh/negative (I might even say punitive) attitude toward mental illness. We are, after all, only about a generation away from an era when we simply locked them up in warehouse-like sanitariums where they were drugged, experimented on, and if difficult to control, chained to the wall and hosed down.
In this case, who knows, anthropological confirmation of what psychologists already know may help build that body of knowledge up to the point where it has enough weight to effect a cultural shift in how we perceive mental illness.