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Discusses a study that described a perturbation method for the identification of linear time-varying systems with an unknown input, voluntary joint input using ensemble data. Theoretical framework of the study; Examination of the performance of the mean removal ensemble data (EMRED); Experimental methods of the study; Experimental results.

Focuses on the development of the frequency separation and exponentially weighted least squares (FSEWLS) method, a method used to estimate the time-varying compliance parameters of the elbow joint, from a single movement. Identification of the mechanical properties of the human neuromusculoskeleton system; Examination of theories applied in this research; Conclusion that FSEWLS identifies the slow time-varying dynamics of the human motor control system.