Fig. 3.

The structure of behavioral variability reveals motor learning dynamics. A: learning rate in the adaptation paradigm correlates with the β value assessed during the predictive-saccade paradigm. B: sample kinematic changes that occur during adaptation for 1 representative subject; each trace is an average of 20 trials, and the shaded region is the SD. Trials before adaptation (dark gray) exhibit smaller amplitudes and shorter durations; trials at the end of adaptation (light gray) exhibit longer durations, particularly due to a delay of the deceleration phase of the movement. C: the changes in duration (ms) that occur during adaptation correlate to predictive-saccade β values, indicating that (fractal) behavioral fluctuation structure relates fundamentally to motor changes that occur during learning (particularly regarding the effort to improve movement accuracy).