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. 2019 May 27;9:7916. doi: 10.1038/s41598-019-43815-1

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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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From cylinder diameter to neural stimulation. Left: Electrical stimulation discrimination experiment. On the x-axis, the electrical stimulation injected for the comparison stimulus (in nC). On the y-axis, the proportions of trials where the comparison stimulus (horizontal axis) appeared larger than the standard (vertical solid line). Black dots corresponds to the data points. Each stimulus was presented 10 times (N = 90). The psychometric function (solid curve) represent the probability of judging the comparison stimulus to be larger than the standard. The horizontal distance between the two dashed lines corresponds to the JND. Right: Mapping between the electrical stimulation and the stimuli size. The grey scale above the top margin indicates the charges used in the main experiment as artificial somatosensory stimuli. Black dots correspond to data points and empty dots indicate the probability of judging the comparison stimulus (horizontal axis) larger than the standard (vertical line) for the different stimulation levels (grey scale).