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Dictionary learning algorithm for Multi-Subject fMRI analysis via temporal and spatial concatenation

Citation Author(s):
Asif Iqbal, Abd-Krim Seghouane
Submitted by:
Asif Iqbal
Last updated:
14 April 2018 - 9:20pm
Document Type:
Poster
Document Year:
2018
Event:
Presenters:
Abd-Krim Seghouane
Paper Code:
1964
 

In recent history, dictionary learning (DL) methods have been successfully used for analyzing multi-subject functional magnetic resonance imaging. These algorithms try to learn group-level spatial activation maps (SM) or voxel time courses (TC) from temporally or spatially concatenated fMRI datasets respectively. However, in multi-subject fMRI studies, we are interested in both group-level TCs as well as SMs. In this paper, we propose a DL algorithm which combines temporally and spatially concatenated fMRI datasets to learn not only the shared TC/SM pairs but also the subject-specific ones. We do this by separating group-level information and sub-specific information from each subject fMRI dataset. Performance of the proposed algorithm is illustrated using simulated as well as experimental task fMRI datasets.

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