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. 2022 Jun 7;11:e72871. doi: 10.7554/eLife.72871

Figure 3. Cursor movement and performance during target task.

(A) Average cursor position during target hits (circle) and nearest misses (diamond) across conditions is shown for the 1st and 12th day of experiments for TI (orange), TII (green), and TIII (yellow) of one subject. (B) Target (black) and angle hit rate (blue) across subjects, conditions, and targets-of-interest are shown with their medians (solid line) and 25 and 75% quartiles (shaded areas) across days. (C) Performance values across subjects and conditions for TI (orange), TII (green), and TIII (yellow) are shown with their medians (solid line) and 25 and 75% quartiles (shaded areas) across days. (D, E) Performance values corresponding to the difference in recruitment threshold (D) and de-recruitment threshold (E) between motor unit (MU)2 and MU1 are shown across subjects and conditions for the last 5 days of training. The median (solid line) and 25 and 75% quartiles (shaded area) for TI (orange), TII (green), and TIII (yellow) are illustrated in steps of 1% maximum voluntary contraction (MVC).

Figure 3.

Figure 3—figure supplement 1. Additional metrics concerning the target-tracking task.

Figure 3—figure supplement 1.

(A) Difference in recruitment threshold of the selected motor unit (MU) pair versus their difference in the de-recruitment threshold for the last 5 days of training (Spearman’s correlation coefficient R=0.46, p=0.001). Each dot represents a MU pair coloured based on the condition. (B) Angle hit rate of all TIII instructed trials during the last 5 days of training versus the within-pair difference in the de-recruitment threshold. (C) Estimation of within-session learning grouped by the three targets TI (orange), TII (green), and TIII (yellow). Learning was estimated by calculating Spearman’s correlation coefficient between performance and consecutive trails per target and condition. Each dot represents the mean correlation coefficient for one subject averaged across conditions and all 14 days of training. A Friedman test revealed no difference between targets (p=0.103). The positive median values indicate small learning within one session across subjects for each target. (D) Subjective experience of controlling MU2 when reaching towards TIII based on the questionnaire response during the last 5 days of training across subjects and conditions are shown by their medians and quartiles.