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. 2021 Nov 22;15:705621. doi: 10.3389/fnins.2021.705621

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Copyright © 2021 Crosse, Zuk, Di Liberto, Nidiffer, Molholm and Lalor.

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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Effects of stimulus-response normalization on TRF amplitude. (A) Frontocentral TRF (channel Fz) calculated from 15 min of speech-EEG data using the envelope feature. The plot shows the TRFs calculated using the original, unnormalized data (bold trace), the stimulus features scaled by a factor of 2 (dotted trace) and the neural response scaled by a factor of 2 (dashed trace). (B) The global field power – calculated as the standard deviation across all 128 EEG channels – for the same 3 conditions as in panel (A).