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. 2019 Sep 14;20:48. doi: 10.1186/s12868-019-0530-8

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© The Author(s) 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Perception thresholds are shown (mean ± standard error) as current (IPT) on the left and as charge (QPT) on the right. IPT and QPT are shown for all pulse forms of 5- and 50 ms durations for the pin- and the patch electrodes. Exp exponential increase, Lin linear increase, B.Exp bounded exponential, Rec rectangular. Blue line = patch electrode, orange line = pin electrode. The pulse shapes are illustrated above the figure