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. 2015 May 2;12:44. doi: 10.1186/s12984-015-0037-1

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© Zhang et al.; licensee BioMed Central. 2015

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. 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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NASA-TLX mean scores of six experiments (SF/1C, SF/3C, SF/5C, NF/1C, NF/3C, NF/5C). 1C: one channel, 3C: three channels, 5C: five channels. Error bars depict standard deviation.