Document Detail

Volume perception in parkinsonian speech.
MedLine Citation:
PMID:  11104195     Owner:  NLM     Status:  MEDLINE    
This study contrasted the volume level of speech production with perceived volume. Fifteen idiopathic patients with Parkinson's disease who have hypophonic dysarthria and 15 healthy age- and sex-matched control subjects participated in this study. Testing took place in a sound-proof room. Ability to regulate volume was tested at three instructional levels of loudness: participants were given no instructions regarding volume (to elicit normal default volume) or were asked to read loudly or quietly. Two types of volume-perception judgments were made. First, an estimate of one's own volume, immediately after speaking (that is, immediate perception), and secondly, an estimation of reading volume after hearing one's own voice played back (that is, playback perception). These perceptual ratings were compared with actual speech volume produced in reading and conversation tasks. It was found that there was less of a difference between patients' production and perception of speech volume compared with that of the control subjects. While patients spoke more quietly than control subjects, they nevertheless perceived (immediate and playback perception) their own speech to be louder than did the control subjects. Patients overestimated the volume of their speech during both reading and conversation. The findings raise the question as to whether impaired speech production is driven by a basic perceptual fault or whether perception is abnormal as a consequence of impaired mechanisms involved in the generation of quiet speech.
A K Ho; J L Bradshaw; T Iansek
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Movement disorders : official journal of the Movement Disorder Society     Volume:  15     ISSN:  0885-3185     ISO Abbreviation:  Mov. Disord.     Publication Date:  2000 Nov 
Date Detail:
Created Date:  2001-03-07     Completed Date:  2001-05-31     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8610688     Medline TA:  Mov Disord     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1125-31     Citation Subset:  IM    
Psychology Department, Monash University, Clayton, Victoria, Australia.
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MeSH Terms
Aged, 80 and over
Analysis of Variance
Auditory Perceptual Disorders / complications,  etiology,  psychology*
Case-Control Studies
Middle Aged
Parkinson Disease / complications,  psychology*
Perceptual Distortion*
Self Assessment (Psychology)
Voice Disorders / etiology,  psychology*

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