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. 2019 Nov 12;9:16570. doi: 10.1038/s41598-019-53118-0

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© The Author(s) 2019

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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Representative examples of spatial trajectories exhibited by the apex for the different experiments. Panel (a) depicts the comparison between the 3D stimulus versus the no stimulus condition. Note that for the 3D stimulus condition the apex veered towards the support whereas for the no stimulus condition the apex grew up to a certain stage and then fell down. Panel (b) depicts the comparison between the thin and the thick 3D stimulus. For both conditions the apex veered towards the stimulus. The vertical solid line represents the 3D stimulus. Panel (c) depicts the comparison between the thin and the thick stimulus presented in 2D. For both conditions the apex grew up to a certain point and then fell down. The vertical dashed line represents the 2D stimulus. Axis x = sagittal axis in mm; axis y = vertical axis in mm.