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. 2018 Oct 20;43(1):1–22. doi: 10.1007/s10919-018-0289-0

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© The Author(s) 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.

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Fig. 1 — Waveforms (top panels) and spectrograms (bottom panels) of the vocalization types used in Experiment 1 and 2: Spontaneous Laughter (Laughter_S), Volitional Laughter (Laughter_V), Spontaneous Crying (Crying_S) and Vowels (‘staccato vowels’). Darker shading on the spectrogram represents higher intensity