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. 2019 Feb 7;9:1642. doi: 10.1038/s41598-018-37537-z

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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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Schematic power spectra of the 25 sounds in the experiment. The notch region was confined to 6–9 kHz, and the outer regions contained the 0.5–6 kHz and 9–20 kHz bands (see Supplementary Information, for details). Note that the lowest sound level (29 dB SPL) was close to the background noise level of the laboratory room (∼30 dBA).