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Migration and schizophrenia: meta-analysis and explanatory framework

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A Correction to this article was published on 12 May 2020

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Abstract

Systematic reviews and meta-analyses suggest that there are increased rates of schizophrenia and related psychoses in first- and second-generation migrants and refugees. Here, we present a meta-analysis on the incidence of non-affective psychotic disorders among first- and second-generation migrants. We found substantial evidence for an increased relative risk of incidence among first- and second-generation migrants compared to the native population. As heterogeneity of included studies was high, effect estimates should be interpreted with caution and as guiding values rather than exact risk estimates. We interpret our findings in the context of social exclusion and isolation stress, and provide an explanatory framework that links cultural differences in verbal communication and experienced discrimination with the emergence of psychotic experiences and their neurobiological correlates. In this context, we discuss studies observing stress-dependent alterations of dopamine neurotransmission in studies among migrants versus non-migrants as well as in subjects with psychotic disorders. We suggest that social stress effects can impair contextualization of the meaning of verbal messages, which can be accounted for in Bayesian terms by a reduced precision of prior beliefs relative to sensory data, causing increased prediction errors and resulting in a shift towards the literal or “concrete” meaning of words. Compensatory alterations in higher-level beliefs, e.g., in the form of generalized interpretations of ambiguous interactions as hostile behavior, may contribute to psychotic experiences in migrants. We thus suggest that experienced discrimination and social exclusion is at the core of increased rates of psychotic experiences in subjects with a migration background.

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Change history

  • 12 May 2020

    In the original article, the reference number #36 is listed with the wrong list of authors. The first author was unfortunately omitted. The correct reference #36 should read: Lasalvia A, Bonetto C, Tosato S, Cristofalo D, Salazzari D et al (2014) First-contact incidence of psychosis in north-eastern Italy: influence of age, gender, immigration and socioeconomic deprivation. Br J Psychiatry 205:127���134. https://doi.org/10.1192/bjp.bp.113.134445.

    Additionally, this reference is cited in Table 1 and Fig. 2 as ���Bonetto (2015)��� and the correct citation is ���Lasalvia (2014)���.

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The authors have no conflicts of interest regarding the contents of this article. We gratefully thank Stephanie Wall and David Gabel for their help in conducting the literature search and screening.

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Henssler, J., Brandt, L., Müller, M. et al. Migration and schizophrenia: meta-analysis and explanatory framework. Eur Arch Psychiatry Clin Neurosci 270, 325–335 (2020). https://doi.org/10.1007/s00406-019-01028-7

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