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. 2019 Oct 9;10:4592. doi: 10.1038/s41467-019-12588-6

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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. 1 — Infant and adult marmoset vocalizations fall into different attractors in the acoustic space. a Spectrograms of infant (top) and adult (bottom) marmoset undirected vocalizations. b Exemplars of three different contact calls: Phee, Cry, and Phee-cry. Vertical lines in the spectrogram indicate the segment used for calculating the power spectral density (PSD) below. c, d The acoustic features of infant and adult contact calls in the Wiener entropy (WE)–f_o space. e, f The max-scaled probability density of infant and adult vocal acoustic features in the WE–f_o space. Source data are provided as a Source Data file.