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. Author manuscript; available in PMC: 2016 Oct 1.
Published in final edited form as: J Child Neurol. 2015 Apr 20;30(12):1676–1685. doi: 10.1177/0883073815578526

Figure 2. Speed-accuracy Trade-off and Index of Performance.

Figure 2

Panel a: Linear regression between Movement Time (MT) (seconds) and Index of Difficulty (ID) for Control (gray) and Dystonia (black). For each group, for each ID, mean values and standard error bars are presented. The trajectory-constrained speed-accuracy trade-off is present in both groups. In dystonia, the trade-off is characterized by increased slope and offset toward longer MT.

Panel b: Index of Performance (IP) (1/seconds) for Control (gray) and Dystonia (black). For each group, mean (box) and standard error (whiskers) are presented. IP is significantly decreased in dystonia (asterisk to describe statistical significance).