Brake, Benjamin, Wieder, Lillian, Hughes, Natasha, Lalinde, Ivonne Saravia, Marr, Danielle, Geagea, Dali, Pick, Susannah, Reinders, Antje A.T. S., Kamboj, Sunjeev K., Thompson, Trevor ORCID: https://orcid.org/0000-0001-9880-782X and Terhune, Devin B. (2025) The induction of dissociative states: a meta-analysis. Biological Psychiatry Global Open Science:100521. ISSN 2667-1743 (Online) (doi:10.1016/j.bpsgos.2025.100521)

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Abstract

Objective
Dissociative states, characterised by discontinuities in awareness and perception, occur in a diverse array of psychiatric disorders and contexts. Dissociative states have been experimentally modelled in the laboratory through various induction methods but relatively little is known about the efficacy and comparability of different experimental methods.
Methods
This meta-analysis quantified dissociative states, as indexed by a standardised instrument (Clinician Administered Dissociative States Scale), at baseline in varied diagnostic categories and in response to different experimental induction methods (psychological techniques and pharmacological agents) in both clinical and non-clinical samples. Primary outcomes were state dissociation effect sizes (Hedges’s g) (PROSPERO registration CRD42022384886). 2,214 papers were screened, yielding 123 eligible articles and 155 effect sizes comprising 6,692 individuals.
Results
High levels of baseline state dissociation were observed in multiple diagnostic categories relative to controls, with the largest effects found in the dissociative and complex subtypes of post-traumatic stress disorder (PTSD-DC). In controlled experiments, induced state dissociation was most pronounced in response to mirror-gazing and multiple pharmacological agents with effects exceeding baseline state dissociation in PTSD-DC in ketamine and cannabis. The effect sizes were characterised by pronounced heterogeneity but were not reliably associated with methodological features of the original studies.
Conclusions
Elevated state dissociation is present in multiple diagnostic categories and comparable or higher levels can be reliably induced in controlled experiments using psychological techniques and pharmacological agents. These results demonstrate the efficacy of several methods for experimentally modelling dissociation and have implications for measuring adverse events and predicting outcomes in clinical interventions involving pharmacological agents.

Item Type:	Article
Uncontrolled Keywords:	dissociative, ketamine, mirror-gazing, NMDAR, psychedelics, PTSD
Subjects:	B Philosophy. Psychology. Religion > BF Psychology
Faculty / School / Research Centre / Research Group:	Faculty of Education, Health & Human Sciences Faculty of Education, Health & Human Sciences > Institute for Lifecourse Development Faculty of Education, Health & Human Sciences > Institute for Lifecourse Development > Centre for Chronic Illness and Ageing Faculty of Education, Health & Human Sciences > School of Human Sciences (HUM)
Last Modified:	07 May 2025 09:53
URI:	http://gala.gre.ac.uk/id/eprint/50321

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