PMC

(a) Vibration mode of point A (main view and middle cross section on x-y plane; (b). Vibration modes of point B (main view and middle cross section on x-z plane; (c). Vibration modes of point C (main view and middle cross section on x-z plane; (d). Vibration modes of point D (main view and middle cross section on x-y plane; (e). Vibration modes of point E (main view and middle cross section on x-y plane; (f). Vibration modes of point F (main view and middle cross section on x-y plane.

Definition of vibration attenuation time.

Primary frequency attenuation curve of group hole blasting vibration.

Results of Experiment 5. Beta power over sensorimotor cortex decreased at the onset and offset of 80 Hz peripheral vibration. (a, b) Topography of the EEG activity averaged over 15–30 Hz during vibration. White circles show electrodes which showed a significant attenuation of beta power during vibration superimposed on (a) the t statistic scalp image and (b) the contrast image. (c) ROI selected for subsequent time‐frequency analyses. (d, e) Time‐frequency t statistic images within an ROI over contralateral sensorimotor cortex for (d) the difference between 80 and 20 Hz vibration conditions, and (e) the difference between 80 Hz vibration and a baseline window. Data are shown in the period prior to, during and following vibration. (f). Time course of beta power modulation for 80 Hz vibration (red) and 20 Hz vibration (blue). The shaded block represents the time when vibration was on. (i, j) Bar graphs showing (g) the completion time (h) and mean‐corrected completion time for the nine‐hole peg task carried out by these subjects. [Colour figure can be viewed at http://wileyonlinelibrary.com]