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- W1691743927 abstract "childhood trauma and psychosis, however the exact mechanism underlying this association remains elusive. Several psychological models have been postulated, but data from large, representative samples specifically investigating possible pathways are scarce. Methods: n two longitudinal population-based studies (NEMESIS-1, N=7076 and NEMESIS-2, N=6646) and one longitudinal cohort study (G.R.O.U.P., including psychotic disorder patients [N=1119], their unaffected siblings [N=1057] and healthy controls [N=589]), childhood trauma, psychotic symptoms and other psychopathology were assessed. In all three studies, differences of effects of trauma with or without intent associated with psychosis were investigated. In NEMESIS-1 and NEMESIS-2, other theories were tested involving specificity of associations of particular trauma types (i.e. physical, sexual or psychological abuse, emotional neglect, growing up in foster care or death of a loved one) and particular psychotic symptoms (i.e. hallucinations in general, auditory-verbal hallucinations, delusions in general or paranoia). In NEMESIS-2, it was investigated whether exposure to childhood trauma was associated with a number of affective symptoms indicative of hopelessness for the future and low self-esteem (based on the ’social defeat’ hypothesis of psychosis), and whether these symptoms in turn were mediators in the association with psychosis. Results: In NEMESIS-1 and NEMESIS-2, trauma with an intention to harm (psychological, sexual or physical abuse) showed a stronger association with psychotic experiences than trauma without intent (death of a loved one) (χ2=58.62, df=1, p<0.001). Similar results for psychotic disorder patients were found in the GROUP study: physical, emotional and sexual abuse was associated more strongly with psychotic symptoms than physical or emotional neglect (B 0.24, CI 0.09–0.40, p=0.002). In NEMESIS-2, symptoms indicative of social defeat (e.g. hopelessness about future and loss of selfconfidence) were strong and separate mediators in the association between childhood trauma and psychotic experiences (proportion of mediating effect 31%) as well as between childhood trauma and the narrower phenotype of psychotic disorder (proportion of mediating effect 87%). No evidence was found indicating that any of the trauma types showed stronger associations with either hallucinations in general, auditory-verbal hallucinations, delusions in general or paranoia. Discussion: Intention-to-harm, possibly through a mechanism of “social defeat”, is the key component which links childhood trauma to psychotic experiences in adulthood. No evidence was found to support psychological theories regarding specific associations between particular types of trauma and particular psychotic symptoms." @default.
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- W1691743927 date "2014-06-03" @default.
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- W1691743927 title "Negative modulation of the synaptic vesicle protein (SV2A): a new pharmacological target for cognitive deficit associated with schizophrenia" @default.
- W1691743927 doi "https://doi.org/10.7490/f1000research.1095560.1" @default.
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