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. 2017 Jun 19;7:3772. doi: 10.1038/s41598-017-04012-0

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© The Author(s) 2017

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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The effect of varying the spindle detection threshold. The p–value for the three parameters (spindle amplitude, incidence rate and duration) calculated from P4 electrode data for different threshold values is shown. The dashed lines correspond to the sham feedback group and the solid lines to the experimental group. The observed significance of alpha spindles incidence rate increase persists for a large range of threshold values.