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Changes in non-manipulated virtual arm trials with practice. Measures of task performance, the absolute angular error (A), movement time (B), and antagonistic co-activation (C) are shown. For the initial practice on Day 1 and more practice on Day 2 the data shown are averaged in non-overlapping 10-trial bins. For the pre-manipulation baseline trials, each 15-trial block is averaged to produce one data point. Error bars represent the standard error.
