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. 2020 Sep 16;70:41. doi: 10.1186/s12576-020-00770-1

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© The Author(s) 2020

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 3 — Subtypes of 50-kHz USVs evoked by stroking of the ventral region. a Representative sonograms during stroking stimulation. b Absolute number of call subtypes during the 60-s stimulus period (left panel) and the 60-s post-stimulus period (right panel). The sonograms were obtained from four different rats. The data are based on 719 calls during the 60-s stimulus period and 385 calls during the 60-s post-stimulus period (n = 6). *p < 0.05, **p < 0.01, between groups, using paired t-test