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A Gripper size during training Blocks with VT versus V Feedback conditions. The square on the right denotes the last 5 trials which were used to calculate the practice effect (PE). B Practice effects over the course of the experiment for VT versus V Feedback conditions. Boxes represent medians and interquartile ranges. Whiskers show largest values within 1.5 times the interquartile ranges. Negative values indicate reduced gripper size and better performance
