Monti, RP;
Anagnostopoulos, C;
Montana, G;
(2017)
Learning population and subject-specific brain connectivity networks via mixed neighborhood selection.
Annals of Applied Statistics
, 11
(4)
pp. 2142-2164.
10.1214/17-AOAS1067.
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Abstract
In neuroimaging data analysis, Gaussian graphical models are often used to model statistical dependencies across spatially remote brain regions known as functional connectivity. Typically, data is collected across a cohort of subjects and the scientific objectives consist of estimating population and subject-specific connectivity networks. A third objective that is often overlooked involves quantifying inter-subject variability, and thus identifying regions or subnetworks that demonstrate heterogeneity across subjects. Such information is crucial to thoroughly understand the human connectome. We propose Mixed Neighborhood Selection to simultaneously address the three aforementioned objectives. By recasting covariance selection as a neighborhood selection problem, we are able to efficiently learn the topology of each node. We introduce an additional mixed effect component to neighborhood selection to simultaneously estimate a graphical model for the population of subjects as well as for each individual subject. The proposed method is validated empirically through a series of simulations and applied to resting state data for healthy subjects taken from the ABIDE consortium.
| Type: | Article |
|---|---|
| Title: | Learning population and subject-specific brain connectivity networks via mixed neighborhood selection |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1214/17-AOAS1067 |
| Publisher version: | https://doi.org/10.1214/17-AOAS1067 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Physical Sciences, Statistics & Probability, Mathematics, Functional connectivity, neuroimaging, graphical models, inter-subject variability, Inverse Covariance Estimation, Functional Connectivity, Graphical Lasso, Effects Models, FMRI, Regression |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Gatsby Computational Neurosci Unit |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10034783 |
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