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. 2019 Dec 11;2:466. doi: 10.1038/s42003-019-0707-9

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 8 — a Mel-spectrograms (128 bands) of 5 English word sounds and one macaque call. b Histogram for multiunit spiking activity on a given recording channel. In all plots, the spectrogram hop size is 40 ms and the window size for firing rates is 10 ms. Note the different scales of the horizontal axes due to different sound lengths.