Cited by 119Hallucinations in medical conditionsSleep and Wakefulness ResearchSchizophrenia research and treatment

What is the link between hallucinations, dreams, and hypnagogic–hypnopompic experiences?

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Waters, Flavie, Blom, Jan Dirk, Dang-Vu, Thien Thanh, Cheyne, Allan J., Alderson-Day, Ben, Woodruff, Peter, Collerton, Daniel·2016·Schizophrenia Bulletin

Abstract

By definition, hallucinations occur only in the full waking state. Yet similarities to sleep-related experiences such as hypnagogic and hypnopompic hallucinations, dreams and parasomnias, have been noted since antiquity. These observations have prompted researchers to suggest a common aetiology for these phenomena based on the neurobiology of rapid eye movement (REM) sleep. With our recent understanding of hallucinations in different population groups and at the neurobiological, cognitive and interpersonal levels, it is now possible to draw comparisons between the 2 sets of experiences as never before. In the current article, we make detailed comparisons between sleep-related experiences and hallucinations in Parkinson's disease, schizophrenia and eye disease, at the levels of phenomenology (content, sensory modalities involved, perceptual attributes) and of brain function (brain activations, resting-state networks, neurotransmitter action). Findings show that sleep-related experiences share considerable overlap with hallucinations at the level of subjective descriptions and underlying brain mechanisms. Key differences remain however: (1) Sleep-related perceptions are immersive and largely cut off from reality, whereas hallucinations are discrete and overlaid on veridical perceptions; and (2) Sleep-related perceptions involve only a subset of neural networks implicated in hallucinations, reflecting perceptual signals processed in a functionally and cognitively closed-loop circuit. In summary, both phenomena are non-veridical perceptions that share some phenomenological and neural similarities, but insufficient evidence exists to fully support the notion that the majority of hallucinations depend on REM processes or REM intrusions into waking consciousness.

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Authors
Waters, F., Blom, J. D., Dang-Vu, T. T., Cheyne, A. J., Alderson-Day, B., Woodruff, P., & Collerton, D.
Affiliations
  • The University of Western Australia (AU)
  • University of Waterloo (CA)
  • Hamad Medical Corporation (QA)
  • Cumbria Northumberland Tyne and Wear NHS Foundation Trust (GB)
Corresponding author
Waters, Flavie
Venue
Schizophrenia Bulletin
Published
2016-06-29
Volume
42
Issue
5
Pages
1098-1109
ISSN
  • 0586-7614 (ISSN-L)
  • 1745-1701
OpenAlex
W2462953046
Cited by
119
References
99
Citations by year
2026: 8 · 2025: 9 · 2024: 19 · 2023: 16 · 2022: 21 · 2021: 17 · 2020: 14 · 2019: 5 · 2018: 7 · 2017: 2 · 2016: 1
FWCI
0.53
Type
journal article
Language
en
Open access
Locations
  • Schizophrenia Bulletin (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Leiden Repository (Leiden University) (submittedVersion)
  • HighWire Press Open Archive (submittedVersion)
  • University of Groningen research database (University of Groningen / Centre for Information Technology) (submittedVersion)
  • Data Archiving and Networked Services (DANS) (submittedVersion)
  • Newcastle University ePrints (Newcastle Univesity)
Funders
Wellcome Trust (WT098455, WT103817)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Hallucinations in medical conditions
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Sleep and Wakefulness Research
  • Health Sciences › Medicine › Psychiatry and Mental health › Schizophrenia research and treatment
Keywords
hallucinations, hypnagogic hallucinations
MeSH terms
Brain, Dreams, Eye Diseases, Hallucinations, Humans, Nerve Net, Parkinson Disease, Schizophrenia, Sleep, REM

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