Disorders of verbal expression in parkinsonism

Adv Neurol. 1984;40:385-93.


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.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged
  • Computers
  • Fourier Analysis
  • Humans
  • Middle Aged
  • Parkinson Disease / complications*
  • Speech Disorders / complications*
  • Speech Intelligibility
  • Voice Disorders / complications*