Issue
EPL
Volume 79, Number 3, August 2007
Article Number 38004
Number of page(s) 5
Section Interdisciplinary Physics and Related Areas of Science and Technology
DOI http://dx.doi.org/10.1209/0295-5075/79/38004
Published online 16 July 2007
EPL, 79 (2007) 38004
DOI: 10.1209/0295-5075/79/38004

Complex networks in brain electrical activity

C. Ray1, 2, G. Ruffini1, J. Marco-Pallarés1, 3, L. Fuentemilla4 and C. Grau4

1  Starlab Barcelona - Barcelona, Spain
2  Department of Physics, Saint Mary's College - Moraga, CA, USA
3  Department of Neuropsychology, Otto von Guericke Universität-Magdeburg - Germany
4  Neurodynamics Laboratory, Department of Psychiatry and Clinical Psychobiology, University of Barcelona - Spain


received 5 January 2007; accepted in final form 19 June 2007; published August 2007
published online 16 July 2007

Abstract
This letter reports a method to extract a functional network of the human brain from electroencephalogram measurements. A network analysis was performed on the resultant network and the statistics of the cluster coefficient, node degree, path length, and physical distance of the links, were studied. Even given the low electrode count of the experimental data the method was able to extract networks with network parameters that clearly depend on the type of stimulus presented to the subject. This type of analysis opens a door to studying the cerebral networks underlying brain electrical activity, and links the fields of complex networks and cognitive neuroscience.

PACS
87.18.Sn - Neural networks.
87.19.Nn - Electrophysiology.
89.75.-k - Complex systems.

© Europhysics Letters Association 2007