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. 2019 Jan 14;9:109. doi: 10.1038/s41598-018-36393-1

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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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Psychometric functions expressed as percent correct for up- and down-sweeps and subsequently converted into d′ values, in the 1I-2AFC labelling task (top) and the 3I-2AFC discrimination task (bottom), as a function of the rate of F0-sweeps expressed in semitones per second. Symbols represent the weighted mean and error bars indicate one weighted standard error of the mean. Note that the size of symbols relates to the weights on each condition reflecting the number of trials collected across all subjects. Lines and surfaces are the Weibull fits with one standard error.