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Title: A longitudinal case-series study of the efficacy of metacognitive training at ameliorating psychosis-related symptoms and cognitive biases
Author: Orchard, Anna Victoria
Awarding Body: University of Essex
Current Institution: University of Essex
Date of Award: 2012
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Background Metacognitive Training (MCT; Moritz, Woodward & Burlon, 2005), a psychological group intervention for psychosis, targets five psychosis-related cognitive biases (the jumping to conclusions [JTC] bias, bias against disconfirmatory evidence [BADE], metamemory, attributional biases and theory of mind deficits). MCT aims to increase attendees' awareness of, and ability to challenge, these biases. Findings suggest MCT improves psychotic symptoms (e.g., Aghotor, Pfueller, Moritz, Weisbrod & Roesch-Ely, 2010) and the JTC bias (e.g., Moritz, Veckenstedt, Randjbar, Vitzthum & Woodward, 2010). Aims The current study investigated MCT's impact on psychotic symptoms, metacognition and three cognitive biases (the JTC bias, BADE and metamemory). Method Twelve participants with psychosis were recruited via NHS Community Mental Health Teams. A case series design was implemented with one baseline, two intervention assessments and one follow-up. Psychotic symptoms were assessed using the Psychotic Symptom Rating Scales (PSYRATS, Haddock, McCarron, Tarrier & Faragher, 1999), the revised Beliefs About Voices Questionnaire (BAVQ-R, Chadwick, Lees & Birchwood, 2000) and the Green Paranoid Thoughts Scale (GPTS, Green et al., 2008). Metacognition was assessed using the short-form of the Metacognitions Questionnaire (MCQ-30, Wells & Cartwright-Hatton, 2004). The JTC bias, BADE and metamemory were assessed using computerised tasks. Results Significant pre- to post-intervention reductions were found on the PSYRATS delusion and hallucination subscales. Negative beliefs about voices (BAVQ-R total) and . dysfunctional metacognitions (MCQ-30 total) also significantly decreased following the intervention. However, the majority of the sample did not display the JTC bias at baseline therefore it was not possible to assess MCT's efficacy at ameliorating this bias. In addition, BADE and metamemory remained unchanged. Conclusion Whilst MeT did not alter cognitive biases, the findings do support the intervention's efficacy at ameliorating psychotic symptoms and metacognition, speaking for its utility with community samples.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available