Scientific article
OA Policy
English

Connectome embedding in multidimensional graph spaces

Published inNetwork neuroscience, vol. 8, no. 4, p. 1129-1148
Publication date2024
First online date2024-12-10
Abstract

Connectomes’ topological organization can be quantified using graph theory. Here, we investigated brain networks in higher dimensional spaces defined by up to 10 graph theoretic nodal properties. These properties assign a score to nodes, reflecting their meaning in the network. Using 100 healthy unrelated subjects from the Human Connectome Project, we generated various connectomes (structural/functional, binary/weighted). We observed that nodal properties are correlated (i.e., they carry similar information) at whole-brain and subnetwork level. We conducted an exploratory machine learning analysis to test whether high-dimensional network information differs between sensory and association areas. Brain regions of sensory and association networks were classified with an 80–86% accuracy in a 10-dimensional (10D) space. We observed the largest gain in machine learning accuracy going from a 2D to 3D space, with a plateauing accuracy toward 10D space, and nonlinear Gaussian kernels outperformed linear kernels. Finally, we quantified the Euclidean distance between nodes in a 10D graph space. The multidimensional Euclidean distance was highest across subjects in the default mode network (in structural networks) and frontoparietal and temporal lobe areas (in functional networks). To conclude, we propose a new framework for quantifying network features in high-dimensional spaces that may reveal new network properties of the brain.

Keywords
  • Connectome
  • Distance
  • Global brain
  • Graph space
  • Network analysis
  • Single brain region
Citation (ISO format)
MACH, Mathieu et al. Connectome embedding in multidimensional graph spaces. In: Network neuroscience, 2024, vol. 8, n° 4, p. 1129–1148. doi: 10.1162/netn_a_00393
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Journal ISSN2472-1751
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