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. 2019 Mar 8;10:449. doi: 10.3389/fpsyg.2019.00449

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Copyright © 2019 Müller, Wendt, Kollmeier, Debener and Brand.

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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(A) Shows correlations between P2_crosscorr amplitudes of neural tracking and peak-pupil dilations (PPDs). (B) Shows correlations between P2_crosscorr amplitudes of neural tracking and subjective effort ratings in ESCUs. Pearson’s correlation revealed no correlation between PPDs and neural tracking (r = 0.29, p = 0.21) or between ESCUs and neural tracking (r = 0.17, p = 0.48).