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. 2019 Feb 6;20:104. doi: 10.1186/s13063-019-3177-y

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 4 — Six virtual reality (VR) programs. a Making scrambled eggs and frying dumplings in a virtual kitchen by controlling a hand and a pair of chopsticks, respectively. b Shooting ceramic plates and vases on a shelf by controlling a pistol in a virtual shooting gallery. c Playing a whack-a-mole game by controlling a wooden mallet hammer in a virtual playground. d Playing basketball in a virtual court, in which the ball is shot by a controller and the height and distance of the basket is varied over time. e Punching with dolls by controlling a big fist in a virtual boxing arena, in which the doll that is hit will retreat to its original position. f Popping balloons by controlling a sword in a virtual fencing hall