Figure 2

Typical EMG patterns averaged across twenty trials by a representative subject for the ST _CS (dark lines) and ST _OS (gray lines) tasks. Time zero corresponds to the alignment time, the time of toe off. Note the early increase in the activity of dorsal muscles, accompanied sometimes by a decrease in the activity of ventral muscles. The EMGs were recorded in muscles of the right side of the body. The EMG scales are in arbitrary units and time is in ms.