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Measured time-locked somatosensory evoked magnetic fields (SEF) before (a) and after (b) applying independent component analysis (ICA). ICA removes the low frequency component peaking at 100 ms and reaching as large as 7 pT. The blue traces represent the x-axis and the red traces are the y-axis component. The black trace in (a) is from the control experiment showing that the observed M100 is not present when the electrodes are slightly off the median nerve.
