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Your search keyword '"Spieker, S."' showing total 2 results
Start Over Author "Spieker, S." Publisher american institute of physics
2 results on '"Spieker, S."'

1. Variations on tremor parameters.

Author

Boose, A., Jentgens, Ch., Spieker, S., and Dichgans, J.

Subjects
TREMOR, PATHOLOGICAL physiology
Abstract

Describes an analysis procedure for long-term tremor recordings. Direct measure of the pathological muscle activity; Quantitative characteristics called 'tremor parameters'; Estimation of tremor severity in clinical studies; Quantification of agonist-antagonist interaction.

Published
1995
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2. Fractal dimension of sustained vowel productions in neurological dysphonias: an acoustic and electroglottographic analysis.

Author

Hertrich I, Lutzenberger W, Spieker S, and Ackermann H

Subjects
Female, Humans, Male, Parkinson Disease physiopathology, Sex Factors, Brain physiopathology, Electromyography, Glottis innervation, Phonetics, Speech Acoustics, Voice Disorders
Abstract

In order to investigate whether nonlinear methods of signal analysis provide a measure of phonatory irregularities in neurogenic voice disorders, the present study computed the fractal dimension (D) both of the electroglottographic (EGG) and the acoustic signal of sustained vowel productions obtained from patients with Parkinson's disease (PD) and cerebellar atrophy (CA). Compared with normal speakers, the female PD group as well as the male and female CA patients showed an increased dimension (D) of the EGG. The dimensional complexity of the acoustic signal largely depended on vowel type. Furthermore, the dimension of the acoustic signal was reduced in male PD patients as compared to the respective controls.

Published
1997
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