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. 2018 Sep 20;8:14112. doi: 10.1038/s41598-018-32504-0

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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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Gaze-foot spatial-temporal coupling. (a) The toe-off interval (TO-interval) is the time at which the subject fixates the target minus the time of TO for stepping on it, where negative values indicate a saccade and subsequent fixation made to the target before TO. The heel contact interval (HC-interval) is the time at which a subject saccades away from the stepping target minus the time of HC on that target, where negative values indicate a saccade away before HC on the target. Illustrated are the TO-intervals across uncertainty conditions, tasks, and target number for the consistent (b) and the variable (c) environments. Also illustrated are the HC-intervals across uncertainty conditions, tasks, and target number for the consistent (d) and the variable (e) environments. Data are represented as mean ± SE. Person illustrations by Amanda Bakkum in (a) used with permission.