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Theories on the evolutionary persistence of psychosis

distinction between in-group and out-group membership that lies at the heart of intergroup conflict, violence and xenophobia. Our hypothesis (the out-group intolerance hypothesis) provides an explanation for the disparities in the prevalence of schizophrenia across the world and for the higher risk of this condition among immigrants and city dwellers. We propose that our hypothesis can account for a range of disparate epidemiological and other findings regarding schizophrenia that have thus far defied explanation by other theories, including the Darwinian by-product formulations reviewed by Kelleher et al.