Fig. 4

Each bar group represents the performance in the pre-training test (dark grey) and in the post- training test (light grey) for RE2 (panel a), absolute directional error (panel b) and absolute extent error (panel c), without visual feedback, for different displacements and directions of the targets as indicated in the horizontal axis. The height of the bars represents the mean value of the indicators; the error bars correspond to the standard error of the indicators. The dotted lines represent the mean value of the indicator during the last target set of the training phase with continuous visual feedback