Document Detail

Residual signal auto-correlation to evaluate speech in Parkinson's disease patients.
MedLine Citation:
PMID:  17220994     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To evaluate the maximum residual signal auto-correlation also known as pitch amplitude (PA) values in patients with Parkinson's disease (PD) patients. METHOD: The signals of 21 Parkinson's patients were compared with 15 healthy individuals, divided according age and gender. RESULTS: Statistical difference was seen between groups for PA, 0.39 for controls and 0.25 for PD. Normal value threshold was set as 0.3; (p<0.001). In the Parkinson's group 80.77%, and in the control group only 12.28%, had a PA<0.3 demonstrating an association between these variables. The dispersion diagram for age and PA for PD individuals showed p=0.01 and r=0.54. There was no significant difference in relation to gender and PA between groups. CONCLUSION: The significant differences in pitchs amplitude between PD patients and healthy individuals demonstrate the methods specificity. The results showed the need of prospective controlled studies to improve the use and indications of residual signal auto-correlation to evaluate speech in PD patients.
José Carlos Pereira; Arthur Oscar Schelp; Arlindo Neto Montagnoli; Ana Rita Gatto; André Augusto Spadotto; Lídia Raquel de Carvalho
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Arquivos de neuro-psiquiatria     Volume:  64     ISSN:  0004-282X     ISO Abbreviation:  Arq Neuropsiquiatr     Publication Date:  2006 Dec 
Date Detail:
Created Date:  2007-01-15     Completed Date:  2008-01-30     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0125444     Medline TA:  Arq Neuropsiquiatr     Country:  Brazil    
Other Details:
Languages:  eng     Pagination:  912-5     Citation Subset:  IM    
School of Engineering of São Carlos, University of São Paulo.
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MeSH Terms
Case-Control Studies
Middle Aged
Parkinson Disease / complications,  physiopathology*
Phonation / physiology*
Sensitivity and Specificity
Sound Spectrography
Speech Acoustics
Speech Disorders / diagnosis*,  etiology,  physiopathology
Speech Perception / physiology
Speech Production Measurement*
Voice Quality

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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