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. 2020 Nov 4;14:592954. doi: 10.3389/fnins.2020.592954

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Copyright © 2020 Mao, Chen, Xie and Xu.

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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Tone hit-rate confusion matrices of the two groups based on the 2D (upper panels) and 3D methods (lower panels). Data were averaged values of all subjects in each group. For each panel of 4 × 4 cells, the columns represent the tone categories defined by the tonal ellipses or the tonal ellipsoids (i.e., within the tonal ellipses or ellipsoids), whereas the rows represent the target tone categories. Value in the cell of row i and column j is the proportion of target tone i inside tonal ellipse (or ellipsoid) j (i = 1, 2, 3, or 4; j = 1, 2, 3, or 4).