FIGURE 2.
Time course and frequency results of the EEG. (A) Filtered EEG data (3–70 Hz with 48 dB/octave phase shift-free Butterworth bandpass filter and 50 Hz notch filter) elicited from the C3 channel of one subject. The black bar indicates the time period during which the typical SMR occurred. (B) The power spectrum density calculated by FFT for each subject (thin lines) and the averaged data from all subjects (thick line).
