This is an old concept originally developed by Lyman Wynne and Margaret Singer in the sixties that opens interesting possibilities for researchers interested in the social origins of psychosis and cognitive problems.
Right, I think i have read the finnish papers, but must have been a while.. I think it is an interesting area, for sure, but have no suitable data at the moment.
I've just had a quick look at your paper. Quite interesting! So, communicational problems in childhood were a strong preditor of reported auditory hallucinations and the analyses using data from twins showed that this is largely explained by genetics. Do you have data on parent's communicational and speech problems?
My recent case study based on participant observation and taken for 13 months in 2013-2014 was assciated with communication in situation of mental disease in elderly female, diagnosed as having very-late-onset of schizophrenia. However, I did not analyzed deep structural patterns and deep structural contents of her delusions but rather informal learning within family having member with psychosis. I described main themes of her delusions and family ways of responding to them. I described specific communication as coping after diagnosis and during recovery since July 2013 -July 2014. I hope to publish the communication from the case in English. I may say, that famale was diagnosed at age 76, having successful medical nurse carreer behind. However issue you highlighted as social origins of mental illnesses is very interesting. In case of very-late-onset of schizophrenia (diagnosed after 60) the way of life has noticed impact. The studies of the others and literature shown associations with lonely life in isolation, lonelines as present social factor. Of course there are the others associated with involutionary processes too as well as factors which are only supposed and these associated with psychosis.
Sorry for replying so late. I was on vacation. In October I hope to publish report as non-clinical case study in educational online journal. The diagnosis of very-late-onset of schizophrenia is of course associated with the aging processes as mentioned by specialists and you. Sensory difficulties are present but except that is emphasized isolation as the way of life or choices. This is rather rare health condition and not so often diagnosed. Of course a few other diseases associated with aging processes have psychiatric features (for ex. delusions) in initial phases, I mean Alzheimer's Disease.