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. 2015 Feb 6;9:5. doi: 10.3389/fnhum.2015.00005

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Copyright © 2015 Tzourio-Mazoyer, Petit, Zago, Crivello, Vinuesa, Joliot, Jobard, Mellet and Mazoyer.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution and reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Right-hand and left-hand manual ability and right minus left asymmetry in finger taps corresponding to Manual Skill Asymmetry (MSA) in right- and left-handers. Left column: the distribution of the MSA in right-handers and left-handers; Right column: the graph that illustrates the significant interaction between the side of finger tapping (right in green, left in red) and manual preference regarding the number of finger taps. Note that while right-handers exhibit a highly significant difference in number of taps because of a 12% decreased performance of the non-dominant hand there is no such a large difference in left-handers, who exhibit only a 5% decrease in non-dominant hand performance. Note that the between-hand difference was significant in both groups (p < 0.0001), but was significantly greater among right-handers (p = 0.0001). Error bars represent one standard error from the mean.