ICA-based sparse feature recovery from fMRI datasets

Abstract : Spatial Independent Components Analysis (ICA) is increasingly used in the context of functional Magnetic Resonance Imaging (fMRI) to study cognition and brain pathologies. Salient features present in some of the extracted Independent Components (ICs) can be interpreted as brain networks, but the segmentation of the corresponding regions from ICs is still ill-controlled. Here we propose a new ICA-based procedure for extraction of sparse features from fMRI datasets. Specifically, we introduce a new thresholding procedure that controls the deviation from isotropy in the ICA mixing model. Unlike current heuristics, our procedure guarantees an exact, possibly conservative, level of specificity in feature detection. We evaluate the sensitivity and specificity of the method on synthetic and fMRI data and show that it outperforms state-of-the-art approaches.
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https://hal.archives-ouvertes.fr/hal-00489506
Contributor : Gaël Varoquaux <>
Submitted on : Saturday, June 5, 2010 - 1:26:41 PM
Last modification on : Thursday, March 7, 2019 - 3:34:14 PM
Document(s) archivé(s) le : Friday, September 17, 2010 - 1:26:01 PM

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  • HAL Id : hal-00489506, version 1
  • ARXIV : 1006.2302

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Gaël Varoquaux, Merlin Keller, Jean Baptiste Poline, Philippe Ciuciu, Bertrand Thirion. ICA-based sparse feature recovery from fMRI datasets. Biomedical Imaging, IEEE International Symposium on, Apr 2010, Rotterdam, Netherlands. IEEE, pp.1177, 2010. 〈hal-00489506〉

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