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. 2020 Jan 30;10:1496. doi: 10.1038/s41598-020-58447-z

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© The Author(s) 2020

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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Experiments 1–3: Two-alternative Forced Choice Procedure. For each trial participants were presented with two consecutive tones and instructed to choose the louder tone. In the active condition (A) participants self-generated one of the two tones (always the standard tone at 70 dB) with a button press. In the passive condition (B) neither tone was produced by the participant. For 25% of trials, incongruent tones were presented that were originally mapped to the opposite visual cue and button press during the acquisition phase.