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. 2020 Feb 17;20(4):1095. doi: 10.3390/s20041095

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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MDS representation of 2 blocks of trials 3 to 30 with real and holographic obstacles, derived from the foot clearances and maximum step heights of both feet from all 12 participants. Panel (A) shows participants identified in Experiment 1 as those with similar crossing maneuvers for real and holographic obstacles (participants 2, 3, 5, 6, 9, and 12). Panel (C) shows participants identified in Experiment 1 as those with exceptionally high lead-foot crossings (participants 4, 7, and 10), and panel (E) shows participants identified as those not raising their trail foot in mixed reality (participants 1, 8, and 11). Each trial object is represented by its trial number and obstacle type (real obstacles: blueish circles, holographic obstacles: grayish squares) and shaded as baseline (trials 3 to 7: brightest color), feedback (trials 8 to 25), and follow-up (trials 26 to 30: darkest color). Panels (B), (D), and (F) show the distances derived from the clearance and maximum step height of both feet, between individual holographic obstacle trials, and the average over all real obstacle trials, again with shades of gray indicating baseline, feedback, and follow-up blocks of trials.