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. 2021 May 27;11:11227. doi: 10.1038/s41598-021-90533-8

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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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Gratings. (a) Profiles of ultrasonic vibration, profiles of lateral force, and the corresponding raster plots are shown for FAI₁ at four distinct frequencies of stimulation: 6, 12, 25 and 85 Hz. Filled/unfilled dots indicate ulnar/radial direction of sliding. Firing followed the frequency of stimulation in a time-locked fashion between 6 to 50 Hz for this unit. Raster plots are also shown for FAI₂ at the same frequencies, where there was no frequency following. (b) Histogram of firing frequencies obtained for each condition are shown for FAI₁.