The psychosocial processes implicated in the development and maintenance of psychosis differ according to both the dimensional attributes (conviction, frequency, associated distress, adverse life impact) and the content or type (e.g., grandiosity, hallucinations, paranoia) of the psychotic symptoms experienced. This has informed the development of 'targeted' cognitive behavioural therapy for psychosis (CBTp): interventions focusing on specific psychological processes in the context of particular symptom presentations. In adults, larger effect sizes for change in primary outcomes are typically reported in trials of targeted interventions, compared to those for trials of generic CBTp approaches with multiple therapeutic foci. We set out to test the theoretical basis for developing targeted CBTp interventions for young people with distressing psychotic-like, or unusual, experiences (UEs). We investigated variations in the psychosocial processes previously associated with self-reported UE severity (reasoning, negative life events, emotional problems) according to UE dimensional attributes and content/type (using an established five-factor model) in a clinically referred sample of 72 young people aged 8-14 years. Regression analyses revealed associations of conviction and grandiosity with reasoning; of frequency, and hallucinations and paranoia, with negative life events; and of distress/adverse life impact, and paranoia and hallucinations, with emotional problems. We conclude that psychological targets for intervention differ according to particular characteristics of childhood UEs in much the same way as for psychotic symptoms in adults. The development of targeted interventions is therefore indicated, and tailoring therapy according to presentation should further improve clinical outcomes for these young people.Key words: psychotic-like experience (PLE); cognitive model; psychosis; cognitive therapy; CBT 4
IntroductionUnusual, or psychotic-like, experiences are changes in thinking and perception that are phenomenologically similar to the symptoms of psychosis, for example, hearing a voice that no-one else can hear [1]. The prevalence of such experiences in childhood is high (around two-thirds of the general population, by self-report) suggesting that they cannot be considered, in isolation, to reliably confer increased risk of psychosis [2]. Rather, it seems that increasing likelihood of future mental illness is determined by particular characteristics and correlates of unusual experiences (UEs), such as associated distress and adverse life events [3,4]. This is consistent with the continuum premise underpinning cognitive models of the development and maintenance of psychosis [5,6]. In these models, UEs are one of a multiplicity of biopsychosocial factors that are hypothesised to cumulatively increase the risk of developing psychosis, but are not in themselves, indicative of 'illness'. Although the degree of continuity of psychotic symptoms with normal experiences has been questioned [7], the implication that UEs ...