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. 2022 Apr 29;13:890753. doi: 10.3389/fphys.2022.890753

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Copyright © 2022 Jin, Shi, Zhang and Yeh.

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(s) 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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Phase-amplitude frequency planes under the three different sound conditions, from left to right corresponds to before, during, and after auditory cues. The top panels show the comodulograms reflecting the PAC across the whole 2-s gait cycle, and the middle panels link to the 1-s LFPs aligned to contralateral heel strike, whereas the bottom panels present the PAC around the 1-s ipsilateral heel strike. The strengths of δ-Lβ/Hβ PAC before providing auditory cues are higher than those after removing cues and are the smallest when applying cues. In addition, PAC around contralateral or ipsilateral heel strikes is higher than that of bilateral steps across three sound conditions. Bi, bilateral; Contra, contralateral; Ipsi, ipsilateral.