Conclusions
The categorical classification that is implicit in the original Kraepelinian dichotomy of schizophrenic and affective psychoses has obscured the continuity of the basic phenomena across conventional diagnoses and with variation in the population as a whole. Kraepelin’s 1920 modification and its implications for developmental and evolutionary theories of the origins of psychosis deserve particular attention. They are consistent with aspects of Kretschmer’s formulation and with what is now known about the epidemiology of the psychoses - that these are phenomena that are intrinsic to human populations. They reflect on the genetic origins of Homo sapiens and the cerebral organization of the function that characterizes the species-language. The generally later onset of affective psychoses and the association of affective symptoms with functions associated with the non-dominant hemisphere provide a lead to the role of affect and non-dominant hemi-sphere function in the organization of language. Sex differences in the spectrum of psychosis and in its correlate are consistent with the hypothesis that a determinant of cerebral asymmetry is located within the Xq21.3/Yp region of homology that was generated by a translocation that occurred after the separation of the chimpanzee and hominid lineages. It is suggested that the critical species-specific variation is subject to epigenetic modification.
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Crow, T.J. (2000). Bipolar shifts as disorders of the bi-hemispheric integration of language: implications for the genetic origins of the psychotic continuum. In: Marneros, A., Angst, J. (eds) Bipolar Disorders. Springer, Dordrecht. https://doi.org/10.1007/0-306-47521-9_16
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