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Fig. 4. Two control experiments. (A) Verification of induced vibrations on the
scanning laser Doppler vibrometer (SLDV) and the extension arm. The noise
level was measured with the accelerometer at the tip of the extension arm
(dotted line). During application of a vertical stimulus (frequency, 10-600
Hz, velocity, 1x10-4 m s-1), the skull velocity
was measured with the SLDV (dashed line) while the accelerometer
simultaneously monitored the motion of the extension arm (solid line). (B)
Relative plot of the mounting block response in three orthogonal directions
for lateral and (C) vertical stimulation. The colors refer to those in
Fig. 3A. The driving direction
(intended excitation direction) of the vibration exciter is represented by a
flat line at 0 dB (green line for lateral, and blue line for vertical
stimulation, respectively).
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