ObjectiveThe aim of this meta‐analysis was to better understand the magnitude and consistency of the association between childhood adversity and borderline personality disorder (BPD) across case–control, epidemiological and prospective cohort studies.MethodFollowing the review protocol (reference: CRD42017075179), search terms pertaining to adversity and BPD were entered into three search engines. Random‐effects meta‐analysis synthesised the size and consistency of the effects.ResultsA total of 97 studies compared BPD to non‐clinical (k = 40) and clinical (k = 70) controls. Meta‐analysis of case–control studies indicated that individuals with BPD are 13.91 (95% CI 11.11–17.43) times more likely to report childhood adversity than non‐clinical controls. This effect was smaller when considering retrospective cohort (OR: 2.59; 95% CI 0.93–7.30) and epidemiological (OR: 2.56, 95% CI 1.24–5.30) studies. Findings were significant across adversity subtypes with emotional abuse (OR: 38.11, 95% CI: 25.99–55.88) and neglect (OR: 17.73, 95% CI = 13.01–24.17) demonstrating the largest effects. Individuals with BPD were 3.15 (95% CI 2.62–3.79) times more likely to report childhood adversity than other psychiatric groups.ConclusionsThis meta‐analysis corroborates theoretical proposals that exposure to adverse life experiences is associated with BPD. It highlights the importance of considering childhood adversity when treating people diagnosed with BPD.
Evidence suggests that dissociation is associated with psychotic experiences, particularly hallucinations, but also other symptoms. However, until now, symptom-specific relationships with dissociation have not been comprehensively synthesized. This is the first prospectively registered (CRD42017058214) meta-analysis to quantify the magnitude of association between dissociative experiences and all symptoms of psychosis. MEDLINE, PsycINFO, PubMed, and Scopus databases were searched using exhaustive terms denoting dissociation and psychotic symptoms. We included both nonclinical (58 studies; 16 557 participants) and clinical (46 studies; 3879 patient participants) samples and evaluated study quality. Ninety-three eligible articles considering 20 436 participants were retained for analysis. There was a robust association between dissociation and clinical and nonclinical positive psychotic symptoms (r = .437; 95%CI: .386 −.486), with the observed effect larger in nonclinical studies. Symptom-specific associations were also evident across clinical and nonclinical studies, and included significant summary effects for hallucinations (r = .461; 95%CI: .386 −.531), delusions (r = .418; 95%CI: .370 −.464), paranoia (r = .447; 95%CI: .393 −.499), and disorganization (r = .346; 95%CI: .249 −.436). Associations with negative symptoms were small and, in some cases, not significant. Overall, these findings confirm that dissociative phenomena are not only robustly related to hallucinations but also to multiple positive symptoms, and less robustly related to negative symptoms. Our findings are consistent with proposals that suggest certain psychotic symptoms might be better conceptualized as dissociative in nature and support the development of interventions targeting dissociation in formulating and treating psychotic experiences.
Purpose To present a treatment protocol for delivering Talking With Voices, a novel intervention for people with psychosis that involves dialogical engagement with auditory hallucinations. Method This paper presents a manualized approach to therapy employed in the Talking With Voices trial, a feasibility and acceptability randomized control trial of 50 adult participants. A rationale for following a treatment manual is provided, followed by the theoretical underpinnings of the intervention and its principles and values, including the main tenet that voices can often be understood as dissociated parts of the self which serve a protective function by indicating social–emotional vulnerabilities. The four therapy phases for improving the relationship between the voice‐hearer and their voices are outlined: (1) engagement and psychoeducation, (2) creating a formulation, (3) dialoguing with voices, and (4) consolidating outcomes, including key milestones at each phase. Implementation issues are discussed, as well as recommendations for best practice and future research. Results The Talking With Voices treatment protocol indicates that it is feasible to manualize a dissociation‐based approach to support service users who are distressed by hearing voices. Conclusion For some individuals, it is possible to engage in productive dialogue with even extremely hostile or distressing voices. Developing coping strategies, creating a formulation, and ultimately establishing a dialogue with voices has the potential to improve the relationship between voice(s) and voice‐hearer. Further research is now required to evaluate feasibility, acceptability, and efficacy. Practitioner points It is feasible to integrate a dissociation model of voice‐hearing within a psychological intervention for people with psychosis. Combining psychosocial education, formulation and direct dialogue can be used to facilitate a more peaceful relationship between clients and their voices. Practitioners trained in other therapeutic modalities can draw on existing transferrable skills to dialogue with their clients’ voices. The input of those with lived experience of mental health difficulties has an important role in guiding treatment design and delivery.
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