More radical participants had less insight into the correctness of their choices & reduced updating of their confidence when presented with post-decision evidence; there is resistance to recognizing & revising incorrect beliefs

Metacognitive Failure as a Feature of Those Holding Radical Beliefs. Max Rollwage, Raymond J. Dolan, Stephen M. Fleming. Current Biology, Volume 28, Issue 24, 17 December 2018, Pages 4014-4021.e8. https://doi.org/10.1016/j.cub.2018.10.053

Highlights
•    Metacognition refers to the ability to reflect on our cognitive processes
•    We investigated metacognitive features of radicalism in a low-level perceptual task
•    Radical participants showed less insight into the accuracy of their decisions
•    Radicals showed smaller confidence shifts in response to disconfirmatory evidence

Summary: Widening polarization about political, religious, and scientific issues threatens open societies, leading to entrenchment of beliefs, reduced mutual understanding, and a pervasive negativity surrounding the very idea of consensus [1, 2]. Such radicalization has been linked to systematic differences in the certainty with which people adhere to particular beliefs [3, 4, 5, 6]. However, the drivers of unjustified certainty in radicals are rarely considered from the perspective of models of metacognition, and it remains unknown whether radicals show alterations in confidence bias (a tendency to publicly espouse higher confidence), metacognitive sensitivity (insight into the correctness of one’s beliefs), or both [7]. Within two independent general population samples (n = 381 and n = 417), here we show that individuals holding radical beliefs (as measured by questionnaires about political attitudes) display a specific impairment in metacognitive sensitivity about low-level perceptual discrimination judgments. Specifically, more radical participants displayed less insight into the correctness of their choices and reduced updating of their confidence when presented with post-decision evidence. Our use of a simple perceptual decision task enables us to rule out effects of previous knowledge, task performance, and motivational factors underpinning differences in metacognition. Instead, our findings highlight a generic resistance to recognizing and revising incorrect beliefs as a potential driver of radicalization.