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Integrated Wavelet Processing and Spatial Statistical Testing of fMRI Data

D. Van De Ville, T. Blu, M. Unser

NeuroImage, vol. 23, no. 4, pp. 1472-1485, December 2004.


We introduce an integrated framework for detecting brain activity from fMRI data, which is based on a spatial discrete wavelet transform. Unlike the standard wavelet-based approach for fMRI analysis, we apply the suitable statistical test procedure in the spatial domain. For a desired significance level, this scheme has one remaining degree of freedom, characterizing the wavelet processing, which is optimized according to the principle of minimal approximation error. This allows us to determine the threshold values in a way that does not depend on data. While developing our framework, we make only conservative assumptions. Consequently, the detection of activation is based on strong evidence. We have implemented this framework as a toolbox (WSPM) for the SPM2 software, taking advantage of multiple options and functions of SPM such as the setup of the linear model and the use of the hemodynamic response function. We show by experimental results that our method is able to detect activation patterns; the results are comparable to those obtained by SPM even though statistical assumptions are more conservative.

The associated software is available here.

@ARTICLE(http://bigwww.epfl.ch/publications/vandeville0406.html,
AUTHOR="Van De Ville, D. and Blu, T. and Unser, M.",
TITLE="Integrated Wavelet Processing and Spatial Statistical Testing of
	{fMRI} Data",
JOURNAL="NeuroImage",
YEAR="2004",
volume="23",
number="4",
pages="1472--1485",
month="December",
note="")

© 2004 Elsevier. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from Elsevier. This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.
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