Cited by 60Functional Brain Connectivity StudiesComplex Network Analysis TechniquesAdvanced Neuroimaging Techniques and Applications

Stability of graph theoretical measures in structural brain networks in Alzheimer’s disease

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Mårtensson, Gustav, Pereira, Joana B., Mecocci, Patrizia, Vellas, Bruno, Tsolaki, Magda, Kłoszewska, Iwona, Soininen, Hilkka, Lovestone, Simon +3 more·2018·Scientific Reports

Abstract

Graph analysis has become a popular approach to study structural brain networks in neurodegenerative disorders such as Alzheimer’s disease (AD). However, reported results across similar studies are often not consistent. In this paper we investigated the stability of the graph analysis measures clustering, path length, global efficiency and transitivity in a cohort of AD ( N = 293) and control subjects ( N = 293). More specifically, we studied the effect that group size and composition, choice of neuroanatomical atlas, and choice of cortical measure (thickness or volume) have on binary and weighted network properties and relate them to the magnitude of the differences between groups of AD and control subjects. Our results showed that specific group composition heavily influenced the network properties, particularly for groups with less than 150 subjects. Weighted measures generally required fewer subjects to stabilize and all assessed measures showed robust significant differences, consistent across atlases and cortical measures. However, all these measures were driven by the average correlation strength, which implies a limitation of capturing more complex features in weighted networks. In binary graphs, significant differences were only found in the global efficiency and transitivity measures when using cortical thickness measures to define edges. The findings were consistent across the two atlases, but no differences were found when using cortical volumes. Our findings merits future investigations of weighted brain networks and suggest that cortical thickness measures should be preferred in future AD studies if using binary networks. Further, studying cortical networks in small cohorts should be complemented by analyzing smaller, subsampled groups to reduce the risk that findings are spurious.

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  • Decreased local and global efficiency is a common characteristic of patients with AD.

    “A decreased local (Zhou and Lui, 2013) and global (Martensson et al., 2018) efficiency is a common characteristic of patients with AD.”

    From Disrupted structural connectivity in ArcAβ mouse model of Aβ amyloidosis (2020) · cites this paper as Martensson et al., 2018

    The citation to Mårtensson et al. is attached to global efficiency, not local efficiency. The Results report significantly increased global efficiency in AD patients for binary networks generated from cortical thickness, and the Discussion reports a stable, significant increase—not the claimed decrease. (LLM, conf=0.91)

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Authors
Mårtensson, G., Pereira, J. B., Mecocci, P., Vellas, B., Tsolaki, M., Kłoszewska, I., Soininen, H., Lovestone, S., Simmons, A., Volpe, G., & Westman, E.
Affiliations
  • Karolinska Institutet (SE)
  • University of Perugia (IT)
  • Inserm (FR)
  • Aristotle University of Thessaloniki (GR)
  • Medical University of Lodz (PL)
  • University of Eastern Finland (FI)
  • Warneford Hospital (GB)
  • King's College London (GB)
  • University of Gothenburg (SE)
Corresponding author
Mårtensson, Gustav
Venue
Scientific Reports
Published
2018-08-02
Volume
8
Issue
1
Pages
11592-11592
ISSN
2045-2322 (ISSN-L)
OpenAlex
W2883196872
Cited by
60
References
75
Citations by year
2026: 2 · 2025: 8 · 2024: 9 · 2023: 7 · 2022: 13 · 2021: 5 · 2020: 8 · 2019: 7 · 2018: 1
FWCI
3.13
Type
journal article
Language
en
Open access
Locations
  • Scientific Reports (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, other-oa)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Research Portal (King's College London) (publishedVersion, other-oa)
  • UEF eRepo (University of Eastern Finland) (submittedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
Funders
  • U.S. Department of Defense (U01 AG024904, W81XWH, W81XWH-12-2-, W81XWH-12, W81XWH1220012, AG024904)
  • Foundation for the National Institutes of Health (W81XWH-12-2-0012, U01AG024904, Grant U01 AG024904, AG024904)
  • Alzheimer's Association (U01 AG024904, W81XWH-12-2-0012)
  • Bristol-Myers Squibb (U01 AG024904, AG024904, W81XWH-12-2-0012)
  • Eli Lilly and Company (U01 AG024904, AG024904, W81XWH-12-2-0012)
  • Pfizer (AG024904, W81XWH-12-2-0012, U01 AG024904)
  • Biogen (W81XWH-12-2-0012, U01 AG024904, AG024904)
  • University of Southern California (W81XWH-12-2-0012, U01 AG024904)
  • F. Hoffmann-La Roche (W81XWH-12-2-0012, AG024904, U01 AG024904)
  • Meso Scale Diagnostics (U01 AG024904, AG024904, W81XWH-12-2-0012)
  • Alzheimer's Disease Neuroimaging Initiative (W81XWH-12-2–0012, U01AG024904, AG024904, W81XWH-12-2-, Department of Defense award number W81XWH-12-2-0012)
  • Åke Wiberg Stiftelse
  • BioClinica (U01 AG024904, W81XWH-12-2-0012, AG024904)
  • Novartis Pharmaceuticals Corporation (W81XWH-12-2-0012, U01 AG024904, AG024904)
  • Northern California Institute for Research and Education (U01 AG024904, W81XWH-12-2-0012)
  • Stiftelsen för Strategisk Forskning
  • Eisai (W81XWH-12-2-0012, U01 AG024904, AG024904)
  • Hjärnfonden
  • Karolinska Institutet
  • Stockholms Läns Landsting
  • Vetenskapsrådet
  • Swedish Brain Power
  • Alzheimerfonden
  • Servier (AG024904, W81XWH-12-2-0012, U01 AG024904)
  • H. Lundbeck A/S (U01 AG024904, AG024904, W81XWH-12-2-0012)
  • IXICO (AG024904, W81XWH-12-2-0012, U01 AG024904)
  • National Institutes of Health (3u01ag024904-10s2, W81XWH, W81XWH-12-2-0012, U01-AG024904, Grant U01 AG024904, AG024904)
  • Genentech (W81XWH-12-2-0012, AG024904, U01 AG024904)
  • Canadian Institutes of Health Research (U01 AG024904, W81XWH-12-2-0012)
  • National Institute on Aging (U01-AG-024904, W81XWH-12-2–0012, AG 024904)
  • National Institute of Biomedical Imaging and Bioengineering (W81XWH-12-2-0012, U01 AG024904, AG024904)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Functional Brain Connectivity Studies
  • Physical Sciences › Physics and Astronomy › Statistical and Nonlinear Physics › Complex Network Analysis Techniques
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Advanced Neuroimaging Techniques and Applications
Keywords
Alzheimer's disease, structural brain networks, graph theory, network stability, clustering coefficient, path length, global efficiency, transitivity, weighted networks, binary networks, brain atlas, cortical thickness, cortical volume, sample size, group composition, subsampling
MeSH terms
Aged, Alzheimer Disease, Cerebral Cortex, Female, Humans, Male, Models, Neurological, Nerve Net

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