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. 2017 Jul 21;7:6127. doi: 10.1038/s41598-017-06417-3

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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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Entrainment to periodic stimuli. (a) Inter-saccadic intervals (ISIs) are plotted as a function of saccade sequence for 5 experimental sessions in monkey X. In the error-clamp trials (red), the target appeared when the monkey looked at the target location (≥7th saccade in the sequence). Error bars indicate ± SD (inter-trial variation). (b) Distributions of ISIs for the 7–12th saccades (clamp period) in trials with (red) and without (black) error-clamp. (c) The ISIs as a function of SOA in the error-clamp (red dashed lines) and non-clamp (control) conditions (black solid lines) for different animals. Error bars indicate SDs of 5 experimental sessions and are shown only for some data points. (d) Coefficient of variation (CV) of ISI for different SOAs. Each data point shows the mean of 5 sessions for each monkey. Blue bars indicate the data during the late part (>2000 ms) of error-clamp condition.