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Independent Component Analysis for Brain fMRI Does Indeed Select for Maximal Independence

Figure 2

The distribution of sources and mixtures for ().

We plot (A–C) the distribution of sources, and (D) the contour plot of mixtures for the case of (). Contrary to the claim made in Daubechies et al., the sources have in fact very peaky and heavy-tailed distributions and are not at all close to a Gaussian distribution. For comparison purposes we also present Gaussian distribution curves (blue, A–B).

Figure 2