Cross-spectral analysis of physiological tremor and muscle activity |
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Authors: | J Timmer M Lauk W Pfleger G Deuschl |
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Institution: | Zentrum für Datenanalyse und Modellbildung, Eckerstr. 1, D-79104 Freiburg, Germany, DE Neurologische Universit?tsklinik Kiel, Niemannsweg 147, D-24105 Kiel, Germany, DE
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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.
Received: 7 October 1996 / Accepted in revised form: 29 January 1998 |
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