Figure 2.
Direction of the actions during the training session, force-cursor transfer functions, and force profile. a, Top, Raw EMG data for one subject during one block of the training session. Second from top, Filtered EMG data (green) and the peaks of the contractions (magenta circles). Third from top, Component x of the acceleration signal. Bottom, Component y of the acceleration signal. b, Zoom in for one trial during the training session. tmax indicates the time point of maximum contraction at that trial. c, Direction of actions in the training. Each blue line represents the direction and the amplitude of a single trial. Black line represents the average of the direction vector across all trials. d, Variations of the force-cursor transfer functions for the Random group in Experiment 1. These random maps included different shapes of linear, logarithmic, exponential, sigmoid, and double-sigmoid functions. e, Example of force profile in a single trial in the Skill group. Shaded areas illustrate the actual data when participants revisited the HOME position.