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- W2325883669 abstract "Over the last decade the bootstrap procedure is gaining popularity in the statistical analysis of neuroimaging data. This powerful procedure can be used for example in the non-parametric analysis of neuro-imaging data. As fMRI data are complexly structured with both temporal and spatial dependencies, such bootstrap procedures may indeed offer an elegant solution. However, a thorough investigation on the most appropriate bootstrapping procedure for fMRI data has to our knowledge never been performed. Friman and Westin (2005) showed that a bootstrap procedure based on pre-whitening the temporal structure of fMRI time series is superior to procedures based on wavelets or Fourier decomposition of the signal, especially in the case of blocked fMRI designs. For time-series, several bootstrap schemes can be exploited though (see e.g. Lahiri, 2003). For the re-sampling of residuals from general linear models fitted on fMRI data, we examine more specifically here the differences between 1) bootstrapping pre-whitened residuals which are based on parametric assumptions of the temporal structure, 2) a blocked bootstrapping which avoids making such assumptions (with several variants like the circular bootstrap,. . . ), and 3) a combination of both bootstrap procedures. We furthermore explore whether the bootstrap procedures is best applied before or after smoothing the volume of interest. Based on real data and simulation studies, we discuss the temporal and spatial properties of the bootstrapped volumes for all possible combinations and nd interesting differences." @default.
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- W2325883669 date "2011-01-01" @default.
- W2325883669 modified "2023-09-26" @default.
- W2325883669 title "Evaluating of bootstrap procedures for fMRI data" @default.
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