Control parameter regulated the chaoticity in the target’s motion.

(A) Representative trajectories of the target [x, y] (red) and cursor [x_c, y_c] (blue). As the control parameter setting a was elevated, increased folding and irregularity became more evident, resulting in lower tracking accuracy. (B) Normalized cursor velocity magnitude as a function of the block number. tended to increase over time. (C) Probability density function in the first and last blocks showed reduced incidence of low-velocity movements with practice. *** represents p < 0.001.