Group linear non-Gaussian component analysis with applications to neuroimaging. (English) Zbl 1543.62656
Summary: Independent component analysis (ICA) is an unsupervised learning method popular in functional magnetic resonance imaging (fMRI). Group ICA has been used to search for biomarkers in neurological disorders including autism spectrum disorder and dementia. However, current methods use a principal component analysis (PCA) step that may remove low-variance features. Linear non-Gaussian component analysis (LNGCA) enables simultaneous dimension reduction and feature estimation including low-variance features in single-subject fMRI. A group LNGCA model is proposed to extract group components shared by more than one subject. Unlike group ICA methods, this novel approach also estimates individual (subject-specific) components orthogonal to the group components. To determine the total number of components in each subject, a parametric resampling test is proposed that samples spatially correlated Gaussian noise to match the spatial dependence observed in data. In simulations, estimated group components achieve higher accuracy compared to group ICA. The method is applied to a resting-state fMRI study on autism spectrum disorder in 342 children (252 typically developing, 90 with autism), where the group signals include resting-state networks. The discovered group components appear to exhibit different levels of temporal engagement in autism versus typically developing children, as revealed using group LNGCA. This novel approach to matrix decomposition is a promising direction for feature detection in neuroimaging.
MSC:
| 62P10 | Applications of statistics to biology and medical sciences; meta analysis |
| 62H25 | Factor analysis and principal components; correspondence analysis |
| 62R07 | Statistical aspects of big data and data science |
Keywords:
big data; functional magnetic resonance imaging (fMRI); group inference; independent component analysis (ICA); matrix decomposition; principal component analysis; resting-state fMRIReferences:
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