Figure 4. Human-controlled balancing with a non-postural hand muscle.

Data are shown for a single subject (A) in the top panel with group means (n= 10) below (B). Subjects were seated on top of an inverted pendulum-like platform that they balanced by modulating the abduction torque generated by the right index finger. Coherence between the vestibular stimulus and EMG activity of the right FDI is shown on the left, and the vestibular-evoked muscle response in FDI is shown on the right. Horizontal lines in the single subject data and thin lines in the group mean data represent the 95% confidence limits.