The aim of the study was to elucidate the factors contributing to the severity and persistence of delusional
conviction. One hundred participants with current delusions, recruited for a treatment trial of psychological
therapy (PRP trial), were assessed at baseline on measures of reasoning, emotions, and dimensions
of delusional experience. Reasoning biases (belief inflexibility, jumping to conclusions, and
extreme responding) were found to be present in one half of the sample. The hypothesis was confirmed
that reasoning biases would be related to delusional conviction. There was evidence that belief inflexibility
mediated the relationship between jumping to conclusions and delusional conviction. Emotional
states were not associated with the reasoning processes investigated. Anxiety, but not depression, made
an independent contribution to delusional conviction.
Keywords: delusions, reasoning, psychosis, schizophrenia
The aim of the study was to elucidate the factors contributing to the severity and persistence of delusionalconviction. One hundred participants with current delusions, recruited for a treatment trial of psychologicaltherapy (PRP trial), were assessed at baseline on measures of reasoning, emotions, and dimensionsof delusional experience. Reasoning biases (belief inflexibility, jumping to conclusions, andextreme responding) were found to be present in one half of the sample. The hypothesis was confirmedthat reasoning biases would be related to delusional conviction. There was evidence that belief inflexibilitymediated the relationship between jumping to conclusions and delusional conviction. Emotionalstates were not associated with the reasoning processes investigated. Anxiety, but not depression, madean independent contribution to delusional conviction.Keywords: delusions, reasoning, psychosis, schizophrenia
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