Mutual Information Better Quantifies Brain Network Architecture in Children with Epilepsy
Joint Authors
Paldino, Michael J.
Zhang, Wei
Muravina, Viktoria
Azencott, Robert
Chu, Zili D.
Source
Computational and Mathematical Methods in Medicine
Issue
Vol. 2018, Issue 2018 (31 Dec. 2018), pp.1-9, 9 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2018-10-22
Country of Publication
Egypt
No. of Pages
9
Main Subjects
Abstract EN
Purpose.
Metrics of the brain network architecture derived from resting-state fMRI have been shown to provide physiologically meaningful markers of IQ in children with epilepsy.
However, traditional measures of functional connectivity (FC), specifically the Pearson correlation, assume a dominant linear relationship between BOLD time courses; this assumption may not be valid.
Mutual information is an alternative measure of FC which has shown promise in the study of complex networks due to its ability to flexibly capture association of diverse forms.
We aimed to compare network metrics derived from mutual information-defined FC to those derived from traditional correlation in terms of their capacity to predict patient-level IQ.
Materials and Methods.
Patients were retrospectively identified with the following: (1) focal epilepsy; (2) resting-state fMRI; and (3) full-scale IQ by a neuropsychologist.
Brain network nodes were defined by anatomic parcellation.
Parcellation was performed at the size threshold of 350 mm2, resulting in networks containing 780 nodes.
Whole-brain, weighted graphs were then constructed according to the pairwise connectivity between nodes.
In the traditional condition, edges (connections) between each pair of nodes were defined as the absolute value of the Pearson correlation coefficient between their BOLD time courses.
In the mutual information condition, edges were defined as the mutual information between time courses.
The following metrics were then calculated for each weighted graph: clustering coefficient, modularity, characteristic path length, and global efficiency.
A machine learning algorithm was used to predict the IQ of each individual based on their network metrics.
Prediction accuracy was assessed as the fractional variation explained for each condition.
Results.
Twenty-four patients met the inclusion criteria (age: 8–18 years).
All brain networks demonstrated expected small-world properties.
Network metrics derived from mutual information-defined FC significantly outperformed the use of the Pearson correlation.
Specifically, fractional variation explained was 49% (95% CI: 46%, 51%) for the mutual information method; the Pearson correlation demonstrated a variation of 17% (95% CI: 13%, 19%).
Conclusion.
Mutual information-defined functional connectivity captures physiologically relevant features of the brain network better than correlation.
Clinical Relevance.
Optimizing the capacity to predict cognitive phenotypes at the patient level is a necessary step toward the clinical utility of network-based biomarkers.
American Psychological Association (APA)
Zhang, Wei& Muravina, Viktoria& Azencott, Robert& Chu, Zili D.& Paldino, Michael J.. 2018. Mutual Information Better Quantifies Brain Network Architecture in Children with Epilepsy. Computational and Mathematical Methods in Medicine،Vol. 2018, no. 2018, pp.1-9.
https://search.emarefa.net/detail/BIM-1132075
Modern Language Association (MLA)
Zhang, Wei…[et al.]. Mutual Information Better Quantifies Brain Network Architecture in Children with Epilepsy. Computational and Mathematical Methods in Medicine No. 2018 (2018), pp.1-9.
https://search.emarefa.net/detail/BIM-1132075
American Medical Association (AMA)
Zhang, Wei& Muravina, Viktoria& Azencott, Robert& Chu, Zili D.& Paldino, Michael J.. Mutual Information Better Quantifies Brain Network Architecture in Children with Epilepsy. Computational and Mathematical Methods in Medicine. 2018. Vol. 2018, no. 2018, pp.1-9.
https://search.emarefa.net/detail/BIM-1132075
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1132075