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. 2019 Feb 26;9:2786. doi: 10.1038/s41598-019-38924-w

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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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Comparison of signal quality for non-penetrating and penetrating electrode arrays. (A) Scatterplot of R² vs SNR values for each unit. Cumulative distributions of (B) R², (C) SNR, and (D) percentage of interspike intervals (ISI) less than 2.5 ms. SNR was calculated for all units recorded from non-penetrating (thick line; n = 655 units) and penetrating (thin gray line; n = 882 units) electrodes. R² was calculated for all units for which limb kinematic data were collected (non-penetrating electrodes, n = 623 units; penetrating electrodes, n = 366).