Evidence map›Paper›PMID 33276451›Full record

ArticleBrain sciences2020

Covert Cognition in Disorders of Consciousness: A Meta-Analysis.

Caroline Schnakers, Michaela Hirsch, Enrique Noé, Roberto Llorens, Nicolas Lejeune, Vigneswaran Veeramuthu, Sabrina De Marco, Athena Demertzi, Catherine Duclos, Ann-Marie Morrissey and 2 more

Abstract read
In one paragraph

Article in Brain sciences, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 27 papers, 3 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
27citing papers in PubMed, 3 pooled it
–field-weighted citation impact
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

27 citing papers in PubMed, 3 syntheses or guidelines pooled it.

  1. Care pathways for individuals with post-anoxic disorder of consciousness (CaPIADoC): an inter-society Consensus Conference.Neurological sciences : official journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology · 2025
    Pooled it
  2. Pooled it
  3. What names for covert awareness? A systematic review.Frontiers in human neuroscience · 2022
    Pooled it
  4. Article
  5. Article
  6. Review
  7. Article
  8. Article
  9. Article
  10. Review
  11. Cognitive Motor Dissociation in Disorders of Consciousness.The New England journal of medicine · 2024
    Article
  12. Article
  13. Article
  14. Disorders of Consciousness: Classification and Taxonomy.Physical medicine and rehabilitation clinics of North America · 2024
    Review
  15. Article
  16. Covert consciousness.NeuroRehabilitation · 2024
    Article
  17. Article
  18. Article
  19. Article
  20. Article
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

12 authors.

Caroline SchnakersCasa Colina Hospital and Centers for Healthcare, Pomona, CA 917697, USA.ORCID 0000-0003-1143-0658
Michaela HirschDepartment of Psychology, University of California Los Angeles, Los Angeles, CA 90095, USA.
Enrique NoéNEURORHB, Servicio de Neurorrehabilitación de Hospitales Vithas, 46011 València, Spain.
Roberto LlorensNEURORHB, Servicio de Neurorrehabilitación de Hospitales Vithas, 46011 València, Spain.
Nicolas LejeuneGIGA-Consciousness, Coma Science Group, University of Liège, 4000 Liège, Belgium.ORCID 0000-0001-6059-606X
Vigneswaran VeeramuthuReGen Rehabilitation Hospital, Petaling Jaya 46200, Malaysia.ORCID 0000-0003-2052-0858
Sabrina De MarcoServicio de Terapia Ocupacional, Clínica Universitaria Reina Fabiola, Universidad Católica de Córdoba, Córdoba X5000 IYG, Argentina.ORCID 0000-0002-5292-5588
Athena DemertziGIGA-Consciousness, Coma Science Group, University of Liège, 4000 Liège, Belgium.
Catherine DuclosSchool of Physical and Occupational Therapy, McGill University, Montreal, QC H3A 0G4, Canada.ORCID 0000-0002-8406-5228
Ann-Marie MorrisseyAgeing Research Centre, Health Research Institute, School of Allied Health, University of Limerick, V94 T9PX Limerick, Ireland.ORCID 0000-0003-2301-2920
Camille ChatelleGIGA-Consciousness, Coma Science Group, University of Liège, 4000 Liège, Belgium.
Anna EstraneoIRCCS Fondazione Don Carlo Gnocchi, 50143 Florence, Italy.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Covert cognition in patients with disorders of consciousness represents a real diagnostic conundrum for clinicians. In this meta-analysis, our main objective was to identify clinical and demographic variables that are more likely to be associated with responding to an active paradigm. Among 2018 citations found on PubMed, 60 observational studies were found relevant. Based on the QUADAS-2, 49 studies were considered. Data from 25 publications were extracted and included in the meta-analysis. Most of these studies used electrophysiology as well as counting tasks or mental imagery. According to our statistical analysis, patients clinically diagnosed as being in a vegetative state and in a minimally conscious state minus (MCS-) show similar likelihood in responding to active paradigm and responders are most likely suffering from a traumatic brain injury. In the future, multi-centric studies should be performed in order to increase sample size, with similar methodologies and include structural and functional neuroimaging in order to identify cerebral markers related to such a challenging diagnosis.

Indexed as

cognitive motor dissociationconsciousnesscovert cognitionminimally conscious statesevere brain injuryvegetative state

Identifiers

PMID33276451
PMCPMC7759773

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.