Mental Illness

Challenging the Genetic Predisposition of Schizophrenia: A Critical Review of Twin Studies

A new article published in the Review of General Psychology deconstructs the long-held belief that schizophrenia is approximately 80% heritable. It challenges the methodologies and underlying assumptions of twin studies, especially the 'equal environments assumption.' The article highlights how historical biases, arbitrary study selections, and flawed diagnostic criteria have led to a misinterpretation of genetic influences, suggesting a much lower heritability rate or even questioning the concept's validity. This critical analysis calls for a re-evaluation of psychiatric genetic research.