Figure 4

Mean curves from all participants (N = 13) per condition (periodic-sinusoidal on the left, chaotic-Lorenz on the right, Stable surface in blue and Unstable surface in red) of the normalised EMG activity of the tibialis anterior (TA), gastrocnemius lateralis (GL), gastrocnemius medialis (GM) and soleus (SOL) muscles as well as the mean curves of the anteroposterior CoP displacement.