Daniel Nettle

Abstract We investigated public beliefs about the extent to which mental disorders are perceived to be part of the true self, that is, the set of traits and behaviors that compose one’s core character. We conducted three quantitative vignette-based studies (total n = 601) in UK general public samples, considering seven disorders (attention deficit hyperactivity disorder (ADHD), anorexia nervosa, autism spectrum disorder (ASD), bipolar disorder, major depressive disorder, schizophrenia, and obsessive-compulsive disorder (OCD)). For each disorder, participants rated how much the disorder reflects the vignette character’s true self, along with perceived causes of the disorders (studies 1 and 2), perceived severity, age of onset, duration, probability of recovery (study 2), and stigmatization (study 3). Disorders differed sharply in the extent to which they were judged to be part of the true self: ADHD, ASD, and OCD received higher true self ratings than major depressive disorder, anorexia nervosa, and schizophrenia, with bipolar disorder intermediate. A disorder was rated more ‘true self’ when it was: perceived as more “biologically” caused; less “psychologically” caused; less severe; and recovery was perceived as less likely. Although the extent of stigmatization also varied across disorders, true self ratings did not predict stigmatization. Our results show that the public thinks about different mental disorders in quite different ways, suggesting that different disorders should not be lumped together when considering attitudes and their consequences.