Grouping individual independent BOLD effects: a new way to ICA group analysis

Jeng-Ren Duann; Tzyy-Ping Jung; Terrence J. Sejnowski; Scott Makeig

doi:10.1117/12.822574

19 March 2009 Grouping individual independent BOLD effects: a new way to ICA group analysis

Jeng-Ren Duann, Tzyy-Ping Jung, Terrence J. Sejnowski, Scott Makeig

Proceedings Volume 7343, Independent Component Analyses, Wavelets, Neural Networks, Biosystems, and Nanoengineering VII; 73430C (2009) https://doi.org/10.1117/12.822574
Event: SPIE Defense, Security, and Sensing, 2009, Orlando, Florida, United States

Abstract

A new group analysis method to summarize the task-related BOLD responses based on independent component analysis (ICA) was presented. As opposite to the previously proposed group ICA (gICA) method, which first combined multi-subject fMRI data in either temporal or spatial domain and applied ICA decomposition only once to the combined fMRI data to extract the task-related BOLD effects, the method presented here applied ICA decomposition to the individual subjects' fMRI data to first find the independent BOLD effects specifically for each individual subject. Then, the task-related independent BOLD component was selected among the resulting independent components from the single-subject ICA decomposition and hence grouped across subjects to derive the group inference. In this new ICA group analysis (ICAga) method, one does not need to assume that the task-related BOLD time courses are identical across brain areas and subjects as used in the grand ICA decomposition on the spatially concatenated fMRI data. Neither does one need to assume that after spatial normalization, the voxels at the same coordinates represent exactly the same functional or structural brain anatomies across different subjects. These two assumptions have been problematic given the recent BOLD activation evidences. Further, since the independent BOLD effects were obtained from each individual subject, the ICAga method can better account for the individual differences in the task-related BOLD effects. Unlike the gICA approach whereby the task-related BOLD effects could only be accounted for by a single unified BOLD model across multiple subjects. As a result, the newly proposed method, ICAga, was able to better fit the task-related BOLD effects at individual level and thus allow grouping more appropriate multisubject BOLD effects in the group analysis.

Citation Download Citation

Jeng-Ren Duann, Tzyy-Ping Jung, Terrence J. Sejnowski, and Scott Makeig "Grouping individual independent BOLD effects: a new way to ICA group analysis", Proc. SPIE 7343, Independent Component Analyses, Wavelets, Neural Networks, Biosystems, and Nanoengineering VII, 73430C (19 March 2009); https://doi.org/10.1117/12.822574

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KEYWORDS

Independent component analysis

Functional magnetic resonance imaging

Brain

Data modeling

Brain mapping

Data acquisition

Hemodynamics

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