Fig. 2

Progression in training. The measures recorded at each session include: a. total number of steps, b. total distance walked, c. average walking speed, and d. average number of steps in uninterrupted bouts of walking. This figure shows averages across all participants (n = 11) in the open circles, with one standard deviation shading. The best-fitting exponential curve (y = a x e ^(−t/c)) is the solid black line, with the equation parameters and variance accounted for (R²) indicated. Equation parameters: t = session number, a = final performance, c = time constant, which is the session number at which 63.2% of the final performance is reached (see Data analyses for details)