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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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Scatter plots of dominant frequency distribution comparing the PD cohort and the ET cohort in different cases. Horizontal axis indicates frequency and the vertical dotted line indicates the optimal frequency threshold between the two cohorts. (A) Under the PSD estimate with Posture 1 (P1). (B) Under the bispectrum estimate with Posture 1 (P1). (C) Under the PSD estimate with Posture 2 (P2). (D) Under the bispectrum estimate with Posture 2 (P2).