Abstract
Using spectral, wavelet, multifractal, and recurrence analyses we examined the features of involuntary shaking (tremor) that occur during the performance of a given motor task. The task was to maintain the efforts of fingers under isometric conditions by a healthy subject, a patient with primary bilateral parkinsonism, and a patient with essential tremor syndrome. The physiological tremor was characterized by the lowest amplitude, a broad power spectrum, the lowest energy of the wavelet spectrum, the highest degree of multifractality, the lowest degree of determinism, and the highest entropy of the recurrence time density. In the case of the essential tremor we observed a significant enhancement of the wavelet spectrum energy and a decrease of the oscillation complexity. This was evident via the occurrence of clear peaks in the power spectra, a decrease in the degree of multifractality, the emergence of a quasi-periodic structure in the recurrence diagrams, an increase in determinism and a decrease of the entropy of recurrence time density. All these trends were increased for the parkinsonian tremor data. These characteristics enable us to quantitatively estimate the degree of deviation of motor function from the healthy case.
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Original Russian Text © O.E. Dick, A.D. Nozdrachev, 2016, published in Fiziologiya Cheloveka, 2016, Vol. 42, No. 3, pp. 47–55.
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Dick, O.E., Nozdrachev, A.D. Features of parkinsonian and essential tremor of the human hand. Hum Physiol 42, 271–278 (2016). https://doi.org/10.1134/S0362119716030063
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DOI: https://doi.org/10.1134/S0362119716030063