Evidence map›Paper›PMID 35781745›Full record

SynthesisEuropean journal of neurology2022

Systematic review of data-driven cognitive subtypes in Parkinson disease.

Dana Pourzinal, Jihyun Yang, Rachael A Lawson, Katie L McMahon, Gerard J Byrne, Nadeeka N Dissanayaka

Open access · hybridAbstract readSystematic Review
In one paragraph

Synthesis in European journal of neurology, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 19 papers, 3 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
19citing papers in PubMed, 3 pooled it
3.5field-weighted citation impact, top 6% 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

19 citing papers in PubMed, 3 syntheses or guidelines pooled it, 31 citations in OpenAlex.

  1. Guideline
  2. Pooled it
  3. Pooled it
  4. Electroencephalography-Based Clustering Reveals Robust Neurophysiological Subtypes in Parkinson's Disease.Movement disorders : official journal of the Movement Disorder Society · 2026
    Article
  5. Article
  6. Review
  7. Article
  8. Review
  9. Article
  10. Article
  11. Article
  12. A predictive model for longitudinal cognitive subtypes in Parkinson's disease.Neurological sciences : official journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology · 2025
    Article
  13. EMitool: Explainable Multi-Omics Integration for Disease Subtyping.International journal of molecular sciences · 2025
    Article
  14. Article
  15. Cognitive impairment in Parkinson's disease and other parkinsonian syndromes.Journal of neural transmission (Vienna, Austria : 1996) · 2025
    Review
  16. Article
  17. Article
  18. Article
  19. 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

6 authors at 3 institutions in 2 countries.

Dana PourzinalFaculty of Medicine, University of Queensland Centre for Clinical Research, Herston, Queensland, Australia.
Jihyun YangFaculty of Medicine, University of Queensland Centre for Clinical Research, Herston, Queensland, Australia.
Rachael A LawsonTranslational and Clinical Research Institute, Newcastle University, Newcastle Upon Tyne, UK.
Katie L McMahonSchool of Clinical Sciences, Faculty of Health, Queensland University of Technology, Brisbane, Queensland, Australia.
Gerard J ByrneFaculty of Medicine, University of Queensland Centre for Clinical Research, Herston, Queensland, Australia.
Nadeeka N DissanayakaFaculty of Medicine, University of Queensland Centre for Clinical Research, Herston, Queensland, Australia.ORCID 0000-0002-0164-3337
The University of Queensland · AUNewcastle University · GBQueensland University of Technology · AU

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

background and purposeRecent application of the mild cognitive impairment concept to Parkinson disease (PD) has proven valuable in identifying patients at risk of dementia. However, it has sparked controversy regarding the existence of cognitive subtypes. The present review evaluates the current literature pertaining to data-driven subtypes of cognition in PD.

methodsFollowing PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) guidelines, systematic literature searches for peer-reviewed articles on the topic of cognitive subtyping in PD were performed.

resultsTwenty-two relevant articles were identified in the systematic search. Subtype structures showed either a spectrum of severity or specific domains of impairment. Domain-specific subtypes included amnestic/nonamnestic, memory/executive, and frontal/posterior dichotomies, as well as more complex structures with less definitive groupings. Preliminary longitudinal evidence showed some differences in cognitive progression among subtypes. Neuroimaging evidence provided insight into distinct patterns of brain alterations among subtypes.

conclusionsRecurring phenotypes in the literature suggest strong clinical relevance of certain cognitive subtypes in PD. Although the current literature is limited, it raises critical questions about the utility of data-driven methods in cognitive research. The results encourage further integration of neuroimaging research to define the latent neural mechanisms behind divergent subtypes. Although there is no consensus, there appears to be growing consistency and inherent value in identifying cognitive subtypes in PD.

Indexed as

Cognitive DysfunctionParkinson DiseaseBrainCognitionHumansNeuroimagingNeuropsychological Testscluster analysiscognitive impairmentdementianeuroimagingParkinson disease

Identifiers

PMID35781745
PMCPMC9796227
OpenAlexW4283793014

What OpenQuestion holds

Textmetadata
LicenceCC BY-NC-ND
Read underepoch 390

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.