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Related Concept Videos

Positive Symptoms Schizophrenia: Hallucinations and Delusions01:26

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Schizophrenia is a complex psychiatric disorder characterized by a range of symptoms that significantly impact cognition, behavior, and emotional regulation. Among these, the positive symptoms stand out as they involve the addition or exaggeration of normal mental functions, deviating markedly from typical behavior and perception. Hallucinations and delusions are prominent positive symptoms, each profoundly affecting the individual's experience of reality.
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The Diagnostic and Statistical Manual of Mental Disorders (DSM) serves as the primary classification system for mental health disorders, providing standardized diagnostic criteria for clinicians and researchers. First published by the American Psychiatric Association (APA) in 1952, the DSM has undergone several revisions to reflect evolving psychiatric understanding. The fifth edition, DSM-5, released in 2013, introduced key updates that expanded diagnostic categories and modified diagnostic...
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The development of psychological disorders, which are characterized by deviant, maladaptive, and personally distressing behaviors, has been explored through several theoretical approaches.
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Schizophrenia, a complex psychiatric disorder, has been historically misunderstood. Early psychological theories attributed its origins to childhood trauma and unresponsive parenting. However, contemporary research largely rejects these notions, favoring the vulnerability-stress hypothesis. This model proposes that individuals with a genetic predisposition to schizophrenia may develop the disorder following exposure to significant environmental stressors. Notably, studies on high-risk...
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Delusional Themes are More Varied Than Previously Assumed: A Comprehensive Systematic Review and Meta-Analysis.

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Summary

This study provides the first comprehensive meta-analysis of delusional themes in psychosis, identifying 37 themes and their prevalence. Cultural context influences theme reporting, especially when using broader assessment methods.

Keywords:
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Area of Science:

  • Psychiatry and Mental Health
  • Clinical Psychology
  • Neuroscience

Background:

  • Delusions are a core symptom of psychosis, often categorized by themes.
  • The full spectrum of reported delusional themes and their prevalence remains poorly understood.
  • Existing classifications may not capture the diversity of themes encountered in clinical practice or across cultures.

Purpose of the Study:

  • To conduct the first comprehensive meta-analysis of delusional themes in adults with psychosis.
  • To examine the prevalence of various delusional themes.
  • To investigate the relationship between delusional themes, clinical characteristics, and cultural variations.

Main Methods:

  • Conducted two multivariate, multilevel, random-effects meta-analyses of 155 studies from 37 countries.
  • Included studies reporting delusional theme prevalence in adults with psychosis.
  • Utilized structured assessment scales and ad hoc/clinical assessments for broader theme inclusion; sensitivity and meta-regression analyses were performed.

Main Results:

  • Identified 37 distinct delusional themes, with 'persecutory/paranoid' being the most common (57.39%).
  • Prevalence ranged from 'persecutory/paranoid' to 'made impulse' (4.90%).
  • Ad hoc theme classifications were more prevalent in non-Western contexts, showing a modest interaction with cultural clusters.

Conclusions:

  • This meta-analysis offers the most extensive overview of delusional themes to date.
  • Many frequently reported themes are absent from current standard classifications.
  • Cultural context plays a role in the reporting of delusional themes, particularly when employing diverse assessment methods.