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. 2020 Jan 16;11:324. doi: 10.1038/s41467-019-14163-5

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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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Fig. 1 — a Spectrogram illustrating two-alternative forced-choice sound level discrimination task in different contrast environments (dynamic random chords) for human listeners. Participants were instructed to judge whether the target sound (100 ms broadband noise) was “quieter” or “louder” than the reference sound (also 100 ms broadband noise). b Examples of psychometric functions from one participant for sound level discrimination in low- (10 dB, blue) and high- (30 dB, red) contrast conditions. c Changes in just noticeable difference (JND, difference in dB between 25% and 75% points on psychometric curve) across participants. Source data for c are provided as a Source Data file.