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. 2018 Jan 18;8:1085. doi: 10.1038/s41598-017-19077-0

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© The Author(s) 2018

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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(A,B) Shown are mean values and SEM (n = 12) of the MEP peak-to-peak amplitude in the two surrounding muscle APB (A) and the prime mover FDI (B) at four different brain stimulation time points (Control, Premotor, Phasic and Tonic) under the two attentional focus conditions (EF and IF). In the surrounding muscle APB, there was a significant interaction effect showing that when adopting a EF contrasted to an IF, surround inhibition was enhanced during the premotor phase. There was a significant main effect of phase in the prime mover FDI (B), reflecting its activation during the motor task. Black bars represent the external (EF) and the whites ones the internal focus of attention (IF). **P ≤ 0.01.