Summary
After years of treatment with the medication levodopa, most individuals with Parkinson
disease (PD) experience fluctuations in response to their medications. Although relatively
consistent perceptual voice improvements have been documented to correspond with these
fluctuations, consistent quantitative data to support this finding are lacking. This
mismatch may have occurred because most of this phonation research has centered on
long-term phonatory measures (ie, across speaking samples and prolonged vowel tasks).
The current study examined short-term phonatory behavior in individuals with PD, specifically
examining fundamental frequency (F0) at the offset and onset of phonation, before and after a voiceless consonant. The
F0 analysis at phonatory offset supported the conclusion that individuals with PD have
difficulty with the rapid offset of voicing, and that they are stopping vocal fold
vibration primarily through vocal fold abduction (without adding tension). The F0 analysis at phonatory onset revealed that all groups use some laryngeal tension at
the initiation of voicing. The tension was lowest for the PD participants who were
in their OFF medication state, and it was highest for the age-matched control participants
and the PD participants in their ON medication states.
Key Words
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Article info
Publication history
Published online: September 04, 2006
Accepted:
July 13,
2006
Identification
Copyright
© 2008 The Voice Foundation. Published by Elsevier Inc. All rights reserved.
