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. Author manuscript; available in PMC: 2007 Sep 21.
Published in final edited form as: IEEE Trans Neural Syst Rehabil Eng. 2006 Jun;14(2):250–254. doi: 10.1109/TNSRE.2006.875567

Fig. 2.

Fig. 2

a) Raw data of single-trial recording; b) after surface Laplacian filtering; c) frequency component over averaged training trials and its envelope features after Hilbert transformation. The signals were recorded from channel C3 of subject #1 for right-hand motor imagery.