Reality monitoring across disorders of reality: Systematic and narrative reviews of dissociation and psychosis.

Reality monitoring is the ability to remember whether information was internally- or externally-generated and is often impaired in clinical populations. Though an altered sense of reality characterizes both dissociation and psychosis, no review has compared reality monitoring between them. This paper compares these fields to inform the relation between dissociation and psychosis and the role of reality monitoring in mental health. First, a systematic review identified four eligible high-quality papers (according to Kmet and Lee's Quantitative Checklist; n = 482) which measured dissociation directly and tested reality monitoring experimentally. Meta-analysis indicated a small significant negative association between reality monitoring and dissociation (Correlation = -0.013, [-0.22, -0.04]), implying reality monitoring impairment in dissociation. Papers were identified from inception to May 15, 2025 through searching Web of Science, Scopus, PsycINFO, PsycARTICLES, EMBASE, and MEDLINE. Next, a narrative review of psychosis and reality monitoring, covering pre-existing systematic reviews and original articles, indicated variation across the clinical spectrum. While clinical psychosis was robustly associated with impaired reality monitoring ability and externalising bias, results at non-clinical and sub-clinical levels were mixed. Finally, the reviews were compared to understand how reality monitoring and research practices vary across dissociation and psychosis. This indicated that both dissociation and psychosis are associated with impaired reality monitoring. Though this suggests a shared cognitive basis, no papers on dissociation included clinical presentations or bias towards internalising/externalising the item's source, meaning any comparison is incomplete. Future research should consider clinical dissociation, reality monitoring bias in dissociation, and compare dissociation and psychosis directly.