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LARS network filtration in the study of EEG brain connectivity

Wang, Y., Chung, M. K., Bachhuber, D. R. W., Schaefer, S. M., Van Reekum, C. M. and Davidson, R. J. (2015) LARS network filtration in the study of EEG brain connectivity. In: Biomedical Imaging (ISBI), 2015 IEEE 12th International Symposium on, pp. 30-33.

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To link to this item DOI: 10.1109/ISBI.2015.7163809

Abstract/Summary

In a brain network, weak and nonsignificant edge weights between nodes signal spurious connections and are often thresh-olded out of the network. The traditional practice of thresholding edge weights at an arbitrary value can be problematic. Network filtration provides an alternative by summarizing the changes in the network topology with respect to a broad range of thresholds. A well established network filtration approach depends on the graphical-LASSO (least absolute shrinkage and selection operator) model, where a sequence of binary networks are obtained based on non-zero sparse inverse covariance (IC) estimates of partial correlations at a range of sparsity parameters. The limitation of the graphical-LASSO network model is that it relies on the structural information rather than actual entries of the sparse IC matrices and therefore can only yield approximate dynamic topological changes in the network. In the current study, we propose a new network filtration approach based on least angle regression (LARS) that yields exact filtration values at which network topology changes, and apply it to study brain connectivity in response to emotional stimuli across different age groups via electroencephalographic (EEG) data.

Item Type:Conference or Workshop Item (Paper)
Refereed:Yes
Divisions:Interdisciplinary centres and themes > Centre for Integrative Neuroscience and Neurodynamics (CINN)
Faculty of Life Sciences > School of Psychology and Clinical Language Sciences > Department of Psychology
Faculty of Life Sciences > School of Psychology and Clinical Language Sciences > Psychopathology and Affective Neuroscience
ID Code:68001

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