Related Experiment Videos
Cross-spectral analysis of physiological tremor and muscle activity. I. Theory and application to unsynchronized
1Zentrum Für Datenanalyse und Modellbildung, Freiburg, Germany. jeti@fdm.uni-freiburg.de
Abstract:
We investigate the relationship between the extensor electromyogram (EMG) and tremor times series in physiological hand tremor by cross-spectral analysis. Special attention is directed to the phase spectrum and the effects of observational noise. We calculate the theoretical phase spectrum for a second-order linear stochastic process and compare the results to measured tremor data recorded from subjects who did not show a synchronized EMG activity in the corresponding extensor muscle. The results show that physiological tremor is well described by the proposed model and that the measured EMG represents a Newtonian force by which the muscle acts on the hand.