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. 2016 May 23;6:26545. doi: 10.1038/srep26545

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Copyright © 2016, Macmillan Publishers Limited

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Experimental procedure: Before the experiment started, we recorded: (a) the sound of the participant’s heart using a Doppler device (main experiment); (b) and “beep” sounds triggered by the participant’s pulse waves measured with a pulse transducer (control experiment). After pre-processing, short samples of their own or another person’s heart sounds were presented, in random order. After each of the 30 trials, participants had to make a forced-choice decision about whether they had heard the sound of their own heartbeats or not, followed by a rating of their confidence in their decision.