Figure 2.

Experiment 1 design and example participant. A, Participants made reaching movements on a tabletop. Vision of the hand was occluded and an LCD screen projected a blue cursor that appeared at the level of the table through a mirror. B, Participants made center-out shooting movements from a central starting position (yellow circle) through different targets (gray circles). During baseline (left), the cursor followed hand position; during mirror reversal training (right), cursor feedback was reflected about the y-axis (vertical dashed line). C, Example hand trajectories from (left to right) baseline, early, middle, and late learning, for one participant. D, Reach direction relative to the target for all target directions. There is a clear drift away from the two targets along the mirroring axis (orange and purple), which persists after visual feedback is removed after trial 140 (gray). For clarity, trials to horizontal targets in which the participant moved toward the opposing target are omitted from this plot (three trials in blue curve). NVF stands for No Visual Feedback (NVF trials are indicated by the gray background).