Evidence map›Paper›PMID 32695475›Full record

ArticleNeuroscience of consciousness2020

The Dream Catcher experiment: blinded analyses failed to detect markers of dreaming consciousness in EEG spectral power.

William Wong, Valdas Noreika, Levente Móró, Antti Revonsuo, Jennifer Windt, Katja Valli, Naotsugu Tsuchiya

Open access · goldAbstract read
In one paragraph

Article in Neuroscience of consciousness, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 20 papers.

0numbers the graph read from it
0cells of the map it votes in
20citing papers in PubMed
2.5field-weighted citation impact, top 10% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

20 citing papers in PubMed, 34 citations in OpenAlex.

  1. Article
  2. A dream EEG and mentation database.Nature communications · 2025
    Article
  3. Article
  4. Dreaming conundrum.Journal of sleep research · 2025
    Review
  5. Article
  6. Article
  7. Article
  8. Article
  9. Article
  10. Review
  11. The vision of dreams: from ontogeny to dream engineering in blindness.Journal of clinical sleep medicine : JCSM : official publication of the American Academy of Sleep Medicine · 2022
    Review
  12. Review
  13. Theories of consciousness.Nature reviews. Neuroscience · 2022
    Review
  14. Article
  15. Review
  16. How deep is the rift between conscious states in sleep and wakefulness? Spontaneous experience over the sleep-wake cycle.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2021
    Article
  17. Article
  18. Article
  19. Article
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

7 authors at 3 institutions in 5 countries.

William WongSchool of Psychological Sciences and Turner Institute for Brain and Mental Health, Monash University, Melbourne, VIC, Australia.ORCID https://orcid.org/0000-0003-2424-1311
Valdas NoreikaDepartment of Psychology, University of Cambridge, Cambridge, UK.
Levente MóróDepartment of Psychology, and Turku Brain and Mind Center, University of Turku, Turku, Finland.
Antti RevonsuoDepartment of Psychology, and Turku Brain and Mind Center, University of Turku, Turku, Finland.
Jennifer WindtPhilosophy Department, Monash University, Clayton, VIC, Australia.
Katja ValliDepartment of Psychology, and Turku Brain and Mind Center, University of Turku, Turku, Finland.
Naotsugu TsuchiyaSchool of Psychological Sciences and Turner Institute for Brain and Mental Health, Monash University, Melbourne, VIC, Australia.ORCID https://orcid.org/0000-0003-4216-8701
University of Turku · FIMonash University · AUAdvanced Telecommunications Research Institute International · JP

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The Dream Catcher test defines the criteria for a genuine discovery of the neural constituents of phenomenal consciousness. Passing the test implies that some patterns of purely brain-based data directly correspond to the subjective features of phenomenal experience, which would help to bridge the explanatory gap between consciousness and brain. Here, we conducted the Dream Catcher test for the first time in a step-wise and simplified form, capturing its core idea. The Dream Catcher experiment involved a Data Team, which measured participants' brain activity during sleep and collected dream reports, and a blinded Analysis Team, which was challenged to predict, based solely on brain measurements, whether or not a participant had a dream experience. Using a serial-awakening paradigm, the Data Team prepared 54 1-min polysomnograms of non-rapid eye movement sleep-27 of dreamful sleep and 27 of dreamless sleep (three of each condition from each of the nine participants)-redacting from them all associated participant and dream information. The Analysis Team attempted to classify each recording as either dreamless or dreamful using an unsupervised machine learning classifier, based on hypothesis-driven, extracted features of electroencephalography (EEG) spectral power and electrode location. The procedure was repeated over five iterations with a gradual removal of blindness. At no level of blindness did the Analysis Team perform significantly better than chance, suggesting that EEG spectral power could not be utilized to detect signatures specific to phenomenal consciousness in these data. This study marks the first step towards realizing the Dream Catcher test in practice.

Indexed as

dreamsEEG correlatesNREM sleepunconsciousnessunsupervised machine learning

Identifiers

PMID32695475
PMCPMC7362719
OpenAlexW3043596444

What OpenQuestion holds

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LicenceCC BY
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Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.