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. 2024 Dec 30;14:31676. doi: 10.1038/s41598-024-80828-x

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© The Author(s) 2024

Open Access This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, which permits any non-commercial use, sharing, 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 you modified the licensed material. You do not have permission under this licence to share adapted material derived from this article or parts of it. 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-nc-nd/4.0/.

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Fig. 6 — (A) The subject, seated in front of the Michelangelo hand, wearing the C2 tactors. The tactors were placed over soft tissue, avoiding the clavicle, coracoid process, and acromion of the scapula. The different placements of the EMG electrode used in this study are also shown. In the first two sessions, the electrode was placed over the right pectoralis muscle, while in sessions 3 and 4, it was positioned over the right and left pectoralis and the left flexor carpi radialis muscle. (B) The EMG and force traces the participant could see on the monitor during training. The horizontal lines are the thresholds for the different levels. The area below level 1 of EMG is the dead zone (see text).