title: Phonatory characteristics of parkinsonian speech before and after morning medication: the ON and OFF states.
abstract: After prolonged treatment with L-dopa, patients with Parkinson's disease (PD) experience fluctuations in motor performance. Changes in voice production have been documented perceptually during periods of fluctuation, but few quantitative changes have been found. The purpose of this study is to examine the acoustic-phonatory characteristics of PD speech before and after taking medication, to determine if fluctuations affected phonation. Nine PD patients participated in this study. Multiple analyses were performed, and revealed that fundamental frequency (Fo) variability in vowels and mean Fo were higher, while intensity range was lower in PD patients compared to controls. When the PD subjects were examined after versus before medication, group differences were small, but phonatory improvements were seen in individual subjects. Discussion focuses on physiological changes and variability in PD, and implications of response fluctuations to speech production.
  
  
  OBJECTIVE
  As a result of this activity, the participant will be able to (1) acquire knowledge and understanding of PD and the voice characteristics commonly associated with PD and (2) understand the effects of L-dopa-related fluctuations on voice production in PD.
authors.affiliation: Department of Communication Disorders, Bowling Green State University, OH 43403, USA. goberma@bgnet.bgsu.edu
authors.forename: Alexander
authors.initials: A
authors.lastname: Goberman
authors.forename: Carl
authors.initials: C
authors.lastname: Coelho
authors.forename: Michael
authors.initials: M
authors.lastname: Robb
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000978:Antiparkinson Agents / Q000494:pharmacology* / Q000627:therapeutic use*; D005260:Female; D006801:Humans; D007980:Levodopa / Q000494:pharmacology* / Q000627:therapeutic use*; D008297:Male; D008875:Middle Aged; D010300:Parkinson Disease / Q000188:drug therapy*; D010699:Phonation / Q000187:drug effects*; D013061:Speech Acoustics; D013997:Time Factors; D014705:Verbal Behavior / Q000187:drug effects*
chemical_list: D000978:Antiparkinson Agents; D007980:Levodopa