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. 2006 Sep 12;4(10):e316. doi: 10.1371/journal.pbio.0040316

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© 2006 Krakauer et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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(A) R_wrist on day 1 (group 1, black circles and black curve) and R_wrist on day 2 after R_arm on day 1 (group 5a, white squares and dashed curve). There were substantial savings from R_arm on day 1 to R_wrist on day 2. Inset: R_wrist on day 1 (group 1, black circles and black curve) and R_wrist on day 2 after R_shoulder on day 1 (group 5b, white squares and dashed curve). There were substantial savings from R_shoulder on day 1 to R_wrist on day 2 (mean difference = 7.75° , p = 0.0157). Inset axes scaled as in main figure.

(B) R_arm on day 1 (group 5, black circles and black curve) and R_arm on day 2 after R_wrist on day 1 (group 4, white squares and dashed curve). There were no significant savings from R_wrist on day 1 to R_arm on day 2. Inset: R_shoulder on day 1 (group 1, black circles and black curve) and R_wrist on day 2 after R_shoulder on day 1 (group 5b, white squares and dashed curve). There were no significant savings from R_wrist on day 1 to R_shoulder on day 2 (mean difference = 4.5° , p = 0.1). Inset axes scaled as in main figure.

(C) First pair of bars showing a statistically significant difference in the reduction in mean directional error in the first six cycles for R_wrist on day 2 , after R_arm on day 1, compared to R_wrist on day 1 (groups 1 vs. 5a, mean difference = 5.52°, p = 0.01). Second pair of bars showing no statistically significant difference in the reduction in mean directional error in the first six cycles for R_arm on day 2, after R_wrist on day 1, compared to R_arm on day 1 (groups 5a versus group 4, mean difference = 3.52°, p = 0.12).