Fig. 5.

Evolution across trials of the experimental kinematic variables. A: amplitude (A) of the cart oscillations. B: frequency (f) of the cart oscillations. C: relative phase between the cart movement and the pendulum movement (θ). Note that the amplitude is defined as the half-distance between the cup extrema. Each of the 433 valid trials was represented by 1 single value of A and f and relative phase by averaging across all of the cycles within 20 ≤ t ≤ 40 s in the trial. Blue and red correspond to the 2 frequency groups. Thick lines denote the mean across participants; the shaded areas denote the standard deviations across participants. deg, Degrees.