Or that they are inevitable results of mild neurological deficiencies; similar to e.g. dyslexia but more strongly stigmatized. If you believe that attribution

Or that they are inevitable results of mild neurological deficiencies; similar to e.g. dyslexia but more strongly stigmatized. If you believe that attribution of consciousness to only yourself is a culturally developed feature (which seems plausible given the existence of many mystics who don't seem to do so) then it is very possible that in some people the machinery that is required to do so doesn't work properly resulting in varying degrees of schizophrenia.