Fig. 1

The experimental setup for measuring the dynamics of postural fluctuations and scalp EEG signals involves visually-guided stabilometer stance in both the control and stroboscopic vision (SV) conditions. In the SV condition, stroboscopic glasses intermittently block visual feedback of balance performance at 1 Hz while subjects regulate their upright stance on the stabilometer. In the control condition, subjects wear the glasses and visually track the stabilometer movement trajectory without visual occlusion. Phase-amplitude coupling analysis between the phase of postural fluctuations and scalp EEGs is conducted to characterize cortico-posture interaction during postural regulation. Stabilogram diffusion analysis (SDA) is used to analyze the non-linear dynamics of postural fluctuations