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. Author manuscript; available in PMC: 2010 Aug 23.
Published in final edited form as: Curr Opin Neurobiol. 2003 Oct;13(5):620–629. doi: 10.1016/j.conb.2003.09.012

Figure 2.

Figure 2

Effects of motion correction on ICA components. (a) The predictability of the data, estimated by the diagonals of the Hat matrix, H = X (X′X)−1 X′, where the columns of X represent the largest 1/3 of the eigenvectors of the covariance matrix, is plotted. The horizontal line is a heuristic used in regression to imply high leverage points. Note that common motion correction schemes (AIR and SPM) do not measurably affect predictability. MCICA = motion corrected ICA. (b) Even after standard motion correction, ICA components indicative of movement can still be isolated.