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. 2020 Sep 7;10:14735. doi: 10.1038/s41598-020-71713-4

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© The Author(s) 2020

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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An example of ground-truth. The blue boundary boxes represent the ground-truth of the pharyngeal swallowing reflex. The starting point of the swallowing reflex is defined as the first video frame of the head of bolus reaching the lower edge of the mandibular ramus. The end point of the swallowing reflex is defined as the last video frame in which the head of the bolus reaches the vallecular sinus until the first time of hyoid bone elevation is triggered by pharyngeal swallowing.