There was a thread like that here on GLP.

Found it fascinating myself and posted on that thread but never reached out to him off this forum.

Theres a psychiatrist Dr J. Who has been researching and working with schizophrenics for many years.

He’s convinced that the voices people here are real voices of external beings...not internal dialogue

He found that the beginnings of schizophrenia always begins with hearing you name called...then requests for “help”...then full dialogue that have the same instructions and tone.

It’s the same progression for all people regardless of gender, age, race or culture. So his assessment seems valid: these voices can not be exclusive to the person