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. 2021 Jan 26;11(2):159. doi: 10.3390/brainsci11020159

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(A) Time evolution of the spectral centroid of each signal-stimulus [N for noise, A for atonal, T for tonal]; the frequency of the different octaves (C2 to C7 on the right) is indicated on the left. (B) Time evolution of spectral entropy. (C) Spectral centroid mean [M] and (D) Spectral centroid variability [SD] throughout the stimulus time. (E) Spectral entropy mean [M] and (F) Spectral entropy variability [SD] throughout the stimulus time. Open circles indicate the means, and color ranges the 95% confidence interval. Statistical significance levels of the differences between T or A against N were indicated by asterisks: (**) when p < 0.01, and (***) when p < 0.001. The same levels, but in solid diamonds (♦), were used for T against A.