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Statistica Sinica 25 (2015), 295-312

A SPARSE REDUCED RANK FRAMEWORK
FOR GROUP ANALYSIS
OF FUNCTIONAL NEUROIMAGING DATA
Mihye Ahn, Haipeng Shen, Weili Lin and Hongtu Zhu
University of North Carolina at Chapel Hill

Abstract: In spatial-temporal neuroimaging studies, there is an evolving literature on the analysis of functional imaging data in order to learn the intrinsic functional connectivity patterns among different brain regions. However, there are only few efficient approaches for integrating functional connectivity pattern across subjects, while accounting for spatial-temporal functional variation across multiple groups of subjects. The objective of this paper is to develop a new sparse reduced rank (SRR) modeling framework for carrying out functional connectivity analysis across multiple groups of subjects in the frequency domain. Our new framework not only can extract both frequency and spatial factors across subjects, but also imposes sparse constraints on the frequency factors. It thus leads to the identification of important frequencies with high power spectra. In addition, we propose two novel adaptive criteria for automatic selection of sparsity level and model rank. Using simulated data, we demonstrate that SRR outperforms several existing methods. Finally, we apply SRR to detect group differences between controls and two subtypes of attention deficit hyperactivity disorder (ADHD) patients, through analyzing the ADHD-200 data.

Key words and phrases: Functional connectivity, lasso, low rank representation, resting-state functional MRI, singular value decomposition.

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