FIG. 5.

Manipulation of power to the reconstructed EMG signals. This figure demonstrates the change in power spectra for the interference reconstructed EMG signal (top row; A) and rectified reconstructed EMG signal (bottom row; B) when the input was removed (left column) or doubled (right column) at various frequency bands (0–12, 12–30, 30–50, 50–100, 100–150, 150–200, 200–250 Hz). Removal or doubling of input was accurately captured in the power spectrum of the interference reconstructed EMG signal (A), whereas the power spectrum of the rectified reconstructed EMG signal did not change significantly with any manipulation (B). The unmodulated signal is reflected in the average of all the lines, excluding the points of manipulation (see also Fig. 3B). The asterisk (*) indicates significant differences (P < 0.001) between the modulated and unmodulated frequency band.