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. 2018 May 17;12:317. doi: 10.3389/fnins.2018.00317

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Copyright © 2018 Zhang, Huang, Liu and Zhang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Boxplots representing the dominant frequencies (from the bispectrum analysis) of the tremor acceleration signals. Horizontal lines of the box indicates maximum, upper quartile, median value, lower quartile and minimum of the group. Panels (A,B) illustrate the condition with the arm-stretching posture (P1); Panels (C,D) illustrate the condition with the arm-rested posture (P2). In panels (A,C), the group pairs considered for statistical analysis include: PD1-PD2, ET1-ET2, PD1-ET1, and PD2-ET2. Significance level (^*): P < 0.05. Group PD = PD1 + PD2; Group ET = ET1 + ET2.