Cluster structure of functional networks estimated from high-resolution EEG data

Abstract

We study the topological properties of functional connectivity patterns among cortical areas in the frequency domain. The cortical networks were estimated from high-resolution EEG recordings in a group of spinal cord injured patients and in a group of healthy subjects, during the preparation of a limb movement. We first evaluate global and local efficiency, as indicators of the structural connectivity respectively at a global and local scale. Then, we use the Markov Clustering method to analyse the division of the network into community structures. The results indicate large differences between the injured patients and the healthy subjects. In particular, the networks of spinal cord injured patient exhibited a higher density of efficient clusters. In the Alpha (7-12 Hz) frequency band, the two observed largest communities were mainly composed by the cingulate motor areas with the supplementary motor areas, and by the pre-motor areas with the right primary motor area of the foot. This functional separation strengthens the hypothesis of a compensative mechanism due to the partial alteration in the primary motor areas because of the effects of the spinal cord injury.

21 pages, 4 figures

References in corpus (7)

• The structure and function of complex networks
• Community structure in social and biological networks
• Uncovering the overlapping community structure of complex networks in nature and society
• Functional cartography of complex metabolic networks
• Scale-free brain functional networks
• Economic Small-World Behavior in Weighted Networks
• Vulnerability and Protection of Critical Infrastructures

Cited by in corpus (1)

• Defecting or not defecting: how to "read" human behavior during cooperative games by EEG measurements