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. 2017 Oct 24;7:13954. doi: 10.1038/s41598-017-13909-9

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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 Virtual Footbridge Dilemma. Stereoscopic image showing a scene from the footbridge virtual dilemma through Oculus Rift head-mounted display as seen in Francis et al.¹⁶. The image is taken from the viewpoint of the participant at the end of the scenario in which the trolley car is about to collide with the virtual avatars standing on the tracks ahead. Participants are able to rotate in the virtual environment and voice commands are included to ensure full understanding of the events playing out.