Barnaby Nelson

Learn More
BACKGROUND Identification of individuals "prodromal" for schizophrenia and other psychotic disorders relies on criteria that predict onset within a brief period. Previous trials and biological research have been predicated on the view that certain "ultra high risk" (UHR) criteria detect "the prodrome", but there is a need to test the validity of these(More)
OBJECTIVE Studies conducted in community samples suggest that psychotic-like experiences are common in the general population, leading to suggestions that they are either variations of normal personality or are different expressions of underlying vulnerability to psychotic disorder. Different types of psychotic symptoms may exist, some being normal variants(More)
IMPORTANCE The ultra high-risk (UHR) criteria were introduced to prospectively identify patients at high risk of psychotic disorder. Although the short-term outcome of UHR patients has been well researched, the long-term outcome is not known. OBJECTIVE To assess the rate and baseline predictors of transition to psychotic disorder in UHR patients up to 15(More)
There is growing interest in the prodromal stage of psychotic disorders, with many services now providing care for these "ultra high risk" (UHR) individuals. However, a reduction in the rate of transition to psychosis has been suspected over the last few years. This has implications for the use of interventions in this population and for the validity of(More)
BACKGROUND The current diagnostic system for subjects at enhanced clinical risk of psychosis allows concurrent comorbid diagnoses of anxiety and depressive disorders. Their impact on the presenting high-risk psychopathology, functioning, and transition outcomes has not been widely researched. METHODS In a large sample of subjects with an At-Risk Mental(More)
OBJECTIVE Studies conducted in community samples indicate that psychotic-like experiences (PLEs) are common in the general population; it has been suggested that such experiences are either variations in normal personality or different expressions of vulnerability to psychotic disorders. The aim of this study was to determine whether different subtypes of(More)
OBJECTIVE We aimed to replicate a recent finding of high prevalence of trauma history in patients at 'ultra-high risk' (UHR) of psychotic disorder and to investigate whether trauma predicts conversion to psychosis in this population. METHOD A consecutive sample of UHR patients was assessed. History of trauma was accessed with the General Trauma(More)
BACKGROUND Social cognitive deficits have been demonstrated in first episode psychosis (FEP) and groups at high risk for developing psychosis but the relative degree of deficit between these groups is unclear. Such knowledge may further our understanding of the importance of these deficits in the development of psychosis. The study aimed to compare the(More)
OBJECTIVE The ultra-high risk clinical phenotype is associated with substantial distress and functional impairment and confers a greatly enhanced risk for transition to full-threshold psychosis. A range of interventions aimed at relieving current symptoms and functional impairment and reducing the risk of transition to psychosis has shown promising results,(More)
Recent years have witnessed widespread interest in the early phase of schizophrenia and other psychotic disorders. Strategies have been introduced to attempt to identify individuals in the prepsychotic or prodromal phase. The most widely used of these approaches is the ultra-high risk (UHR) approach, which combines known trait and state risk factors for(More)