Evidence map›Paper›PMID 31402877›Full record

ArticleFrontiers in psychiatry2019

Brain Peak Width of Skeletonized Mean Diffusivity (PSMD) and Cognitive Function in Later Life.

Ian J Deary, Stuart J Ritchie, Susana Muñoz Maniega, Simon R Cox, Maria C Valdés Hernández, Michelle Luciano, John M Starr, Joanna M Wardlaw, Mark E Bastin

Abstract read
In one paragraph

Article in Frontiers in psychiatry, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 43 papers.

0numbers the graph read from it
0cells of the map it votes in
43citing papers in PubMed
–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

43 citing papers in PubMed.

  1. Trial
  2. Trial
  3. Article
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  5. General cognitive function and the brain's structural connectome.bioRxiv : the preprint server for biology · 2026
    Article
  6. Article
  7. Article
  8. Pulse Pressure Impairs Cognition via White Matter Disruption.Hypertension (Dallas, Tex. : 1979) · 2025
    Article
  9. Article
  10. Article
  11. Article
  12. Article
  13. Article
  14. Lessons we learned from the Lothian Birth Cohorts of 1921 and 1936.Genomic psychiatry : advancing science from genes to society · 2025
    Article
  15. Article
  16. Retinal perfusion is linked to cognition and brain MRI biomarkers in Black Americans.Alzheimer's & dementia : the journal of the Alzheimer's Association · 2024
    Article
  17. Review
  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

9 authors.

Ian J DearyDepartment of Psychology, University of Edinburgh, Edinburgh, United Kingdom.
Stuart J RitchieDepartment of Psychology, University of Edinburgh, Edinburgh, United Kingdom.
Susana Muñoz ManiegaCentre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, Edinburgh, United Kingdom.
Simon R CoxDepartment of Psychology, University of Edinburgh, Edinburgh, United Kingdom.
Maria C Valdés HernándezCentre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, Edinburgh, United Kingdom.
Michelle LucianoDepartment of Psychology, University of Edinburgh, Edinburgh, United Kingdom.
John M StarrCentre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, Edinburgh, United Kingdom.
Joanna M WardlawCentre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, Edinburgh, United Kingdom.
Mark E BastinCentre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, Edinburgh, United Kingdom.

Funding

Medical Research Council G0701120Medical Research Council G1001245Medical Research Council MR/K026992/1Medical Research Council MR/M013111/1Medical Research Council MR/N027558/1Medical Research Council MR/R024065/1
6 · The paper itself

Abstract

It is suggested that the brain's peak width of skeletonized water mean diffusivity (PSMD) is a neuro-biomarker of processing speed, an important aspect of cognitive aging. We tested whether PSMD is more strongly correlated with processing speed than with other cognitive domains, and more strongly than other structural brain MRI indices. Participants were 731 Lothian Birth Cohort 1936 members, mean age = 73 years (SD = 0.7); analytical sample was 656-680. Cognitive domains tested were as follows: processing speed (5 tests), visuospatial (3), memory (3), and verbal (3). Brain-imaging variables included PSMD, white matter diffusion parameters, hyperintensity volumes, gray and white matter volumes, and perivascular spaces. PSMD was significantly associated with processing speed (-0.27), visuospatial ability (-0.23), memory ability (-0.17), and general cognitive ability (-0.25); comparable correlations were found with other brain-imaging measures. In a multivariable model with the other imaging variables, PSMD provided independent prediction of visuospatial ability and general cognitive ability. This incremental prediction, coupled with its ease to compute and possibly better tractability, might make PSMD a useful brain biomarker in studies of cognitive aging.

Indexed as

agingcognitiondiffusion MRIprocessing speedPSMDstructural MRIwhite matter

Identifiers

PMID31402877
PMCPMC6676305

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Registered trials

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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.