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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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Measurement practices in hallucinations research.

David Smailes1, Ben Alderson-Day2, Cassie Hazell3

  • 1Department of Psychology, Northumbria University, Newcastle upon Tyne, UK.

Cognitive Neuropsychiatry
|November 8, 2021
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Hallucinations research shows significant variation in measurement methods, with some source monitoring tasks lacking reliability. This study highlights the need for improved measurement practices in understanding hallucinatory experiences.

Keywords:
Hallucinationsmeasurementopen sciencepsychosis

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Area of Science:

  • Psychology
  • Cognitive Science

Background:

  • A renewed focus on measurement practices is evident in psychology, yet this trend has largely bypassed hallucinations research.
  • Inconsistent measurement approaches can hinder the reliability and comparability of findings in this field.

Purpose of the Study:

  • To investigate cross-study variability in the measurement of hallucinatory experiences.
  • To assess the reliability of measurements derived from source monitoring and signal detection tasks commonly used in hallucinations research.

Main Methods:

  • Study 1: Analyzed the usage of the Launay-Slade Hallucination Scale (LSHS) across 100 studies to identify variations.
  • Study 2: Evaluated the reliability of source monitoring and signal detection tasks using data from four recent publications.

Main Results:

  • Study 1 revealed considerable variation in LSHS application and often incomplete methodological descriptions.
  • Study 2 indicated a spectrum of reliability estimates for source monitoring and signal detection tasks, with some source monitoring measures demonstrating unacceptably low reliability.

Conclusions:

  • Suboptimal measurement practices appear prevalent in hallucinations research.
  • Recommendations are provided for enhancing measurement consistency and rigor in future studies on hallucinatory experiences.