Technical Program

Paper Detail

Paper:	SA-PM-PS3.5
Session:	Functional, Dynamic and Parametric Imaging
Time:	Saturday, April 8, 13:30 - 14:50
Presentation:	Poster
Title:	Robust Statistics for Nonparametric Group Analysis in fMRI
Authors:	Sébastien Mériaux; CEA, Service Hospitalier Frédéric Joliot
	Alexis Roche; CEA, Service Hospitalier Frédéric Joliot
	Bertrand Thirion; INRIA Futurs
	Ghislaine Dehaene-Lambertz; INSERM U562, Service Hospitalier Frédéric Joliot
Abstract:	In order to deal with inhomogeneous populations of subjects in fMRI studies, we propose several robust statistics to perform group analysis: sign statistic, Wilcoxon's signed rank statistic and empirical t-statistic. The test's significance levels are calibrated using the same sign permutation framework as in Holmes et al. (1996), allowing for exact specificity control under a mild symmetry assumption about the subjects' distribution. The benefit of the robust approach is illustrated with group analysis results obtained from a speech listening experiment involving three month-old infants.

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