In contrast, all 11 studies of psychotic-affective conditions, which included 12 analyses, showed faster or stronger effects of the illusion associated with these conditions, for at least 1 test: 6 of these analyses compared schizophrenia subjects versus controls, 4 analysed levels of schizotypy, psychoticism or psychosis proneness, one analysed borderline personality subjects, and one analysed subjects with c9orf72-mutation induced frontotemporal dementia. Here, C9orf72 is linked to schizophrenia.