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. 2021 Oct 22;11:20881. doi: 10.1038/s41598-021-99846-0

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© The Author(s) 2021

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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An analysis of gaze densities demonstrates a bias in gaze toward the body for participants during the blur condition in the medium terrain. (a) The average gaze distribution relative to the planted foot in the binocular condition for the medium (top) and rough (bottom) terrains. This distribution is two-dimensional, though here it is viewed from a single angle that allows us to view the distribution along the path, i.e., the x-axis here corresponds to the participant’s current walking direction so that the positive direction is down the path in front of the observer. The relationship between these distributions and the summary statistics shown in b, are described in the “Methods” section and follow the methodology depicted in Fig. 6. (b) The two panels on the left show gaze density around footholds 1–6 footholds ahead, derived as described in the “Methods” section, for medium (top) and rough terrains (bottom). Note that the rough terrain shows a greater allocation of gaze to nearer footholds (specifically 2 footholds ahead). The blue and red curves show the binocular and blur conditions for the 8 normal participants. The panels on the right show the within participants differences (purple) between the binocular and blur conditions. Error bars are $\pm 1$ SEM.