Medium range cognitive impairment (MeRCI) hypothesis for psychosis formation: evidence from epidemiological studies and recent molecular genetic developments.

The author comments on pieces of evidence for medium range cognitive impairment (MeRCI) hypothesis for psychosis formation from epidemiological studies and latest molecular genetic developments. Topics covered include the difficulty to understand delusions and psychotic symptoms within a simple framework, a proposal that delusions may emerge under MeRCI and factors driving psychosis in individuals.