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Simulation study (a) An original correlation map generated from a transform of real experimental data. (b) The addition of a global component to each channel of the original map, results in overestimate in correlations. (c) The conventional regression method to remove the global component underestimates the real correlations seen in (a). (d) Using the ICA method to eliminate the global component faithfully reproduces the qualitative behavior of the correlations seen in (a).
