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. 2018 Jan 3;5(3):1700771. doi: 10.1002/advs.201700771

Figure 5.

Figure 5

sEMG recordings on the face. A) Rectified EMG (raw signal in red/blue, integrated for 200 ms in white) from tattoo electrodes (red) on the right corner of the mouth and from Ag/AgCl pregelled electrodes (blue), on the left side. B) Power spectrum of the right and left EMG in the activity period, normalized to the respective total power. The hole at 50 Hz is due to the notch filter. C) Picture of subject wearing tattoo and Ag/AgCl electrodes on face. Inset shows detail of tattoo electrodes placed at right corner of mouth and its capability to follow the complex topography of face during muscle contraction.