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. 2017 Feb 27;5:9. doi: 10.3389/fbioe.2017.00009

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Copyright © 2017 Patel, Craig, Schumacher, Burns, Florescu and Vinjamuri.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or 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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(A) The 3 × 4 button grid required three levels of extension (labeled in blue) for each finger [index (I), middle (M), ring (R), and pinky (P)]. For reference, each button number is provided in black. (B) The percent number of tasks that involved a specific button is shown for set 1 (blue) and set 2 (red). Buttons 5, 6, 11, and 12 showed differences in frequency. (C) The first 3 (of 12) principal components derived from set 1 and set 2 tasks are shown. In PC1, weight proportions are similar to (B). In the remaining PCs, the covariance patterns are distributed. (D) The fraction of variance that each of the 12 PCs account for is shown. Distributions of variance are similar across both groups.