Are clinical delusions adaptive?

Eugenia Lancellotta is a PhD student in Philosophy of Psychology at the University of Birmingham. Under the supervision of Lisa Bortolotti , she works on the adaptiveness of delusions, especially outside schizophrenia spectrum disorder. In this post, she discusses her paper “ Are clinical delusions adaptive ?” co-authored with Lisa Bortolotti, that recently appeared in WIREs. In popular culture, and even in part of the scientific culture, delusions are still considered as the mark of madness. It would then seem to be counterintuitive to ask whether such bizarre, irrational and often harmful beliefs can be biologically or psychologically adaptive. A trait or mechanism is considered to be biologically adaptive when it favours the reproductive success and survival of the organism it belongs to (Wakefield 1992). By analogy with biological adaptiveness, a trait is deemed to be psychologically adaptive when it delivers psychological benefits which support the wellbeing and good psychol...