Measurement practices in hallucinations research

Smailes, David, Alderson-Day, Ben, Hazell, Cassie, Wright, Abigail and Moseley, Peter (2021) Measurement practices in hallucinations research. Cognitive Neuropsychiatry. pp. 1-16. ISSN 1354-6805 (In Press)

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Official URL: https://doi.org/10.1080/13546805.2021.1999224

Abstract

Introduction
In several sub-fields of psychology, there has been a renewed focus on measurement practices. As far as we are aware, this has been absent in hallucinations research. Thus, we investigated (a) cross-study variation in how hallucinatory experiences are measured and (b) the reliability of measurements obtained using two tasks that are widely employed in hallucinations research.

Method
In Study 1, we investigated to what extent there was variation in how the Launay-Slade Hallucination Scale (LSHS) has been used across 100 studies. In Study 2, we investigated the reliability of the measurements obtained through source monitoring and signal detection tasks, using data from four recent publications. Materials/data are available at doi: 10.17605/osf.io/d3gnk/.

Results
In Study 1, we found substantial variation in how hallucinatory experiences were assessed using the LSHS and that descriptions of the LSHS were often incomplete in important ways. In Study 2, we reported a range of reliability estimates for the measurements obtained using source monitoring and signal discrimination tasks. Some measurements obtained using source monitoring tasks had unacceptably low levels of reliability.

Conclusions
Our findings suggest that suboptimal measurement practices are common in hallucinations research and we suggest steps researchers could take to improve measurement practices.

Item Type: Article
Additional Information: Funding information: This research was funded in whole, or in part, by the Wellcome Trust [Grant number WT108720]. For the purpose of open access, the author has applied a CC BY public copyright licence to any Author Accepted Manuscript version arising from this submission.
Uncontrolled Keywords: Hallucinations, psychosis, measurement, open science
Subjects: C800 Psychology
Department: Faculties > Health and Life Sciences > Psychology
Related URLs:
Depositing User: Elena Carlaw
Date Deposited: 15 Nov 2021 15:44
Last Modified: 15 Nov 2021 15:46
URI: http://nrl.northumbria.ac.uk/id/eprint/47732

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