Abstract
We investigate the relationship between the extensor electromyogram (EMG) and tremor time 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.
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Received: 7 October 1996 / Accepted in revised form: 29 January 1998
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Timmer, J., Lauk, M., Pfleger, W. et al. Cross-spectral analysis of physiological tremor and muscle activity . Biol Cybern 78, 349–357 (1998). https://doi.org/10.1007/s004220050439
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DOI: https://doi.org/10.1007/s004220050439