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. 2017 Nov 1;7:14842. doi: 10.1038/s41598-017-13861-8

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© The Author(s) 2017

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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Experimental design and procedure. Exemplar experimental block order for the initial three out of a total of six blocks are shown in the top row. Electrocardiography (ECG) recordings superimposed with detected R peaks (i.e. R) are shown alongside with sound stimulation periods (S). Sound omission periods are highlighted in red color. Description of the sound stimulation methods for each experimental block is indicated at the bottom.