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. 2021 Sep 9;12:5336. doi: 10.1038/s41467-021-25476-9

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© The Author(s) 2021

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. 2 — A Schematic of the two-alternative forced choice (2AFC) frequency discrimination task in humans. B Psychometric curve fit to the fraction of “higher” responses for vibrations with equal reference (A_REF) and test amplitudes (A_TEST) at 11.8 μm (black), and for 6 tested amplitude change factors (ACF = A_PROBE/A_REF) of an example subject tested at the 440 Hz reference frequency. C A^k x f equal-pitch curve fits (blue lines) to vibration amplitude as a function of the median (error bars: ±quartiles, colored symbols) frequency shift ratio (normalized to the reference frequency, black square, see Methods for details) of n = 9 subjects, for 160, 200, 280, 440, and 480 Hz reference frequencies. Source data are provided as a Source Data file.