Figure 1.

Illustration of the task design: all tasks were performed on a force plate in semitandem stance. The experiments consisted of three different task types: (1) during the “Postural Task” (P), subjects fixated on a visual dynamic stimulus; (2) during the “Cognitive-Postural Task” (CP), participants performed a visual or auditory one-back task; (3) during the “Cognitive-Cognitive-Postural Task” (CCP), subjects performed an auditory and a visual one-back task in conjunction.