Investigation of a traumatic psychosis subgroup: a cluster analysis of an antipsychotic free cohort.

Auditory verbal hallucinations and childhood trauma subtypes across the psychosis continuum: a cluster analysis

“…The current findings somewhat contrast with two previous studies involving cluster analysis of trauma subtypes in psychosis populations. Stevens et al (2019) found two clusters distinguished predominantly by childhood emotional abuse and physical or emotional neglect, whereas the current study found that emotional abuse and emotional neglect clustered together. Similar to the current study, Carbone et al (2019) found a low trauma cluster, however differed in their second and third cluster which consisted of predominantly abuse/neglect and isolation/lack of support, respectively.…”

“…Similar to the current study, Carbone et al (2019) found a low trauma cluster, however differed in their second and third cluster which consisted of predominantly abuse/neglect and isolation/lack of support, respectively. These differences in the clusters may be explained by variations in samples, with Stevens et al (2019) and Carbone et al (2019) both being restricted to small, clinical samples of people with a psychotic disorder diagnosis. The current study was the first to examine clusters across a spectrum of clinical and non-clinical voices specifically, and controls without voices.…”

“…This enables a more "bottom up", data-driven approach to studying naturally co-occurring groups, rather than pre-defining them on the basis of existing categories. Cluster analysis has successfully been used to cluster participants according to trauma subtypes in populations with psychosis (Stevens et al, 2019). Stevens et al (2019) found that a cluster with moderate scores across all trauma subtypes with high scores on physical and emotional neglect, and another cluster with higher overall scores with very high emotional abuse.…”

“…Cluster analysis has successfully been used to cluster participants according to trauma subtypes in populations with psychosis (Stevens et al, 2019). Stevens et al (2019) found that a cluster with moderate scores across all trauma subtypes with high scores on physical and emotional neglect, and another cluster with higher overall scores with very high emotional abuse. Those in the high abuse cluster had more severe hallucinations and delusions, implicating that emotional abuse may be particularly important in the development of these symptoms.…”

Targeting dissociation using cognitive behavioural therapy in voice hearers with psychosis and a history of interpersonal trauma: A case series

“…A broad range of complementary research findings, including large‐scale epidemiological studies (e.g., Shevlin et al ., 2013), prospective studies of trauma survivors (e.g., Cutajar et al ., 2010), prognostic research in at‐risk groups (Brew, Doris, Shannon, & Mulholland, 2018), and comprehensive meta‐analyses of longitudinal and retrospective investigations (Varese, Smeets, et al ., 2012) have confirmed that exposure to potentially traumatic life events (e.g., physical and sexual violence, emotional abuse, neglect, or bullying) dramatically increases the risk of developing psychotic symptoms. In parallel, a large body of evidence suggests that people with psychosis who have a history of trauma present with more severe and disabling psychotic symptoms, in particular positive symptoms of psychosis such as delusions and hallucinations (Bailey et al ., 2018; Stevens et al ., 2019).…”