• Frances Shawyer, Andrew Mackinnon, John Farhall, Eliza Sims, Simone Blaney, Priscilla Yardley, Maree Daly, Paul Mullen, and David Copolov.
• The Mental Health Research Institute of Victoria, Parkville, Victoria 3052, Australia. frances.shawyer@med.monash.edu.au
• J. Nerv. Ment. Dis. 2008 May 1; 196 (5): 390-8.

AbstractAlthough harmful command hallucinations have been linked to violent behavior, few studies have examined factors mediating this relationship. The principal aim of this study was to examine a range of factors potentially associated with acting on harmful command hallucinations using a multivariate approach. The sample comprised 75 participants drawn from community and forensic services. Measures assessing characteristics of the command hallucination and the hallucinator, including forensic risk factors, were administered. Using ordinal logistic regression, we found compliance to be associated with increasing age, viewing the command hallucination as positive, congruent delusions, and reporting low maternal control in childhood. Antipsychotic medication was protective while, contrary to expectations, traditional predictors of violence reduced the odds of compliance with command hallucinations viewed as threatening. The findings suggest that compliance with harmful commands is driven by a complex interaction between beliefs related to the command hallucination and personal characteristics, with risk of compliance increasing with age.

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