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  • Title: Disorders of verbal expression in parkinsonism.
    Author: Streifler M, Hofman S.
    Journal: Adv Neurol; 1984; 40():385-93. PubMed ID: 6695616.
    Abstract:
    The present study shows that rigor is one of the main causative factors in the parkinsonian speech disorder, whereas tremor ordinarily can only play a minor role. The Fast Fourier Analysis of the frequency spectra demonstrated in parkinsonian speech frequency regions that are energy-deficient and also that the entire frequency spectrum is restricted to a range of 100 to 400 Hz, including the deficient regions, as against the 100- to 700-Hz range in the controls. These analytical findings seem to underline the important role played by the laryngeal and breathing dysfunctions in the parkinsonian voice and speech production.
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