Timeseries (left panels) and NSRs (right panels) of the first perturbation round of one representative participant. From top to bottom: platform perturbation, pusher perturbation, ankle angle, hip angle, sway angle, ankle torque, and hip torque. The mean is depicted by the solid line and the standard deviation over the eight cycles by the grey area. The black line in the right panels depicts NSR=1. Ideally, the average NSR of the responses remains below one. The responses of the participant were consistent, as evidenced by small standard deviations over the adjacent segments and low NSRs. This means that a large part of the data is captured by the time-invariant MIMO system identification technique.
Boonstra et al. Journal of NeuroEngineering and Rehabilitation 2013 10:23 doi:10.1186/1743-0003-10-23