The truth is in there: Belief processes in the human brain

Author:

Gerchen Martin Fungisai1234ORCID,Glock Carina12,Weiss Franziska1,Kirsch Peter123

Affiliation:

1. Department of Clinical Psychology, Central Institute of Mental Health Heidelberg University/Medical Faculty Mannheim Mannheim Germany

2. Department of Psychology Heidelberg University Heidelberg Germany

3. Bernstein Center for Computational Neuroscience Heidelberg/Mannheim Mannheim Germany

4. Heidelberg Academy of Sciences and Humanities Heidelberg Germany

Abstract

AbstractBelief, defined by William James as the mental state or function of cognizing reality, is a core psychological function with strong influence on emotion and behavior. Furthermore, strong and aberrant beliefs about the world and oneself play important roles in mental disorders. The underlying processes of belief have been the matter of a long debate in philosophy and psychology, and modern neuroimaging techniques can provide insight into the underlying neural processes. Here, we conducted a functional magnetic resonance imaging study with N = 30 healthy participants in which we presented statements about facts, politics, religion, conspiracy theories, and superstition. Participants judged whether they considered them as true (belief) or not (disbelief) and reported their certainty in the decision. We found belief‐associated activations in bilateral dorsolateral prefrontal cortex, left superior parietal cortex, and left lateral frontopolar cortex. Disbelief‐associated activations were found in an anterior temporal cluster extending into the amygdala. We found a larger deactivation for disbelief than belief in the ventromedial prefrontal cortex that was most pronounced during decisions, suggesting a role of the vmPFC in belief‐related decision‐making. As a category‐specific effect, we found disbelief‐associated activation in retrosplenial cortex and parahippocampal gyrus for conspiracy theory statements. Exploratory analyses identified networks centered at anterior cingulate cortex for certainty, and dorsomedial prefrontal cortex for uncertainty. The uncertainty effect identifies a neural substrate for Alexander Bain's notion from 1859 of uncertainty as the real opposite of belief. Taken together, our results suggest a two‐factor neural process model of belief with falsehood/veracity and uncertainty/certainty factors.

Funder

Deutsche Forschungsgemeinschaft

Bundesministerium für Bildung und Forschung

Heidelberger Akademie der Wissenschaften

Publisher

Wiley

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