Understanding jumping to conclusions in patients with persecutory delusions: working memory and intolerance of uncertainty

BACKGROUND

Persecutory delusions are a key psychotic experience. A reasoning style known as 'jumping to conclusions' (JTC) - limited information gathering before reaching certainty in decision making - has been identified as a contributory factor in the occurrence of delusions. The cognitive processes that underpin JTC need to be determined in order to develop effective interventions for delusions. In the current study two alternative perspectives were tested: that JTC partially results from impairment in information-processing capabilities and that JTC is a motivated strategy to avoid uncertainty.

METHOD

A group of 123 patients with persistent persecutory delusions completed assessments of JTC (the 60:40 beads task), IQ, working memory, intolerance of uncertainty, and psychiatric symptoms. Patients showing JTC were compared with patients not showing JTC.

RESULTS

A total of 30 (24%) patients with delusions showed JTC. There were no differences between patients who did and did not jump to conclusions in overall psychopathology. Patients who jumped to conclusions had poorer working memory performance, lower IQ, lower intolerance of uncertainty and lower levels of worry. Working memory and worry independently predicted the presence of JTC.

CONCLUSIONS

Hasty decision making in patients with delusions may partly arise from difficulties in keeping information in mind. Interventions for JTC are likely to benefit from addressing working memory performance, while in vivo techniques for patients with delusions will benefit from limiting the demands on working memory. The study provides little evidence for a contribution to JTC from top-down motivational beliefs about uncertainty.

Social cognition in bulimia nervosa: a systematic review

OBJECTIVE

Clinical accounts and previous evidence suggest that socio-emotional impairments may be present in people with bulimia nervosa (BN). The aim of this paper was to systematically review studies of social cognition, and to evaluate whether social cognitive deficits exist in BN.

METHOD

Keywords were identified using an existing model of social cognition (Green et al., 2007) [16], and used to search for relevant papers in three online databases. Records were then screened according to a priori inclusion/exclusion criteria.

RESULTS

Five papers reporting seven social cognition tasks were identified as pertinent to the review. All involved either theory of mind ability or emotional processing skills. Participants with BN had impaired performance on the Levels of Emotional Awareness Scale and showed greater attentional bias than controls on an emotional Stroop task. There were no overall group differences for any other tasks, although there were small differences for some specific test items.

CONCLUSIONS

Basic social cognition does not appear to be impaired in people with BN. Future research should make use of more complex, ecologically valid measures, and consider the relationship between task performance and everyday social functioning.

"A computer isn't gonna judge you": a qualitative study of users' views of an internet-based cognitive behavioural guided self-care treatment package for bulimia nervosa and related disorders

Little is known about what determines uptake and acceptability of internet-based treatments in eating disorders, and users' experience with such treatments. We investigated these factors in participants of a randomized controlled trial of an internet-based cognitive- behavioural treatment (iCBT) package (Overcoming bulimia online). Nine participants were interviewed using purposive sampling. The content of interviews were analyzed using thematic analysis. Additionally, participants received questionnaires about their impressions of iCBT. Participants talked about their experience of using iCBT, its impact and compared it to other treatments. Questionnaire responses echoed themes identified in the interviews. iCBT was received positively as a way of fitting treatment into busy lives. Comments on the layout of some of the package content and the practitioner support offered were identified as areas that could be modified or improved.

A randomized controlled trial of internet-based cognitive-behavioural therapy for bulimia nervosa or related disorders in a student population

BACKGROUND

Bulimic eating disorders are common among female students, yet the majority do not access effective treatment. Internet-based cognitive-behavioural therapy (iCBT) may be able to bridge this gap.

METHOD

Seventy-six students with bulimia nervosa (BN) or eating disorder not otherwise specified (EDNOS) were randomly assigned to immediate iCBT with e-mail support over 3 months or to a 3-month waiting list followed by iCBT [waiting list/delayed treatment control (WL/DTC)]. ED outcomes were assessed with the Eating Disorder Examination (EDE) at baseline, 3 months and 6 months. Other outcomes included depression, anxiety and quality of life.

RESULTS

Students who had immediate iCBT showed significantly greater improvements at 3 and 6 months than those receiving WL/DTC in ED and other symptoms.

CONCLUSIONS

iCBT with e-mail support is efficacious in students with bulimic disorders and has lasting effects.