Holding on to false beliefs: The bias against disconfirmatory evidence over the course of psychosis.
OBJECTIVE
The ability to integrate evidence into a reasoning process is crucial in order to react to changing information, e.g. to adapt one's beliefs according to new evidence or to generate new beliefs when facing better alternatives. Evidence integration ability is thus associated with belief flexibility. A specific bias of evidence integration, a bias against disconfirmatory evidence (BADE), can be found in patients with schizophrenia and has been linked to delusion development and maintenance. Knowledge about whether the BADE occurs already in risk constellations of psychosis can clarify its role in the pathogenesis of psychosis.


METHODS
This article reviews the current literature on BADE. Many studies demonstrate BADE over the course of illness, ranging from healthy controls with subclinical properties of schizotypy, over patients with at-risk mental states (ARMS) and patients with a first episode of psychosis to patients with chronic schizophrenia. These data allow a comparison of competences and deficits over the course of illness. Underlying mechanisms of BADE are discussed, including interrelations with neurocognitive performance and dopaminergic processes.


RESULTS
The BADE could be found in different phases of psychosis development and can be regarded as a cognitive marker of the beginning psychotic state.


CONCLUSIONS
The presented findings are derived from independent cross-sectional studies. So far, no comprehensive longitudinal assessment has been published.


CONCLUSIONS
Treatments of metacognitive deficits in general and as early as in the ARMS might interfere with the cognitive pathogenesis of psychosis, and thereby ameliorate, postpone or even prevent the transition to psychosis.
Department of Psychiatry and Psychotherapy, Central Institute of Mental Health, University of Heidelberg/Medical Faculty Mannheim, J5, 68159 Mannheim, Germany. Electronic address: sarah.eisenacher@zi-mannheim.de.
Sarah
S
Eisenacher
Department of Psychiatry and Psychotherapy, Central Institute of Mental Health, University of Heidelberg/Medical Faculty Mannheim, J5, 68159 Mannheim, Germany.
Mathias
M
Zink
D015982:Bias; D003469:Culture; D006801:Humans; D012565:Schizophrenic Psychology
Belief flexibility; Bias against disconfirmatory evidence; Evidence integration; Psychosis; Schizophrenia