![]() Conclusion: In addition to increased vocal intensity following LSVT, speakers with PD exhibited both improved harmonic structure and voice quality as reflected by cepstral/spectral analysis, indicating that there was improved harmonic structure and reduced dysphonia following treatment. Vocal tremor is considered a neurogenic voice disorder and is described as having a nearly rhythmic alteration, or modulation, in pitch and loudness. ![]() Correlation analyses demonstrated that CPP was more strongly associated with CSID before treatment than after. After restricting the frequency cutoff to the region just above the first formant and second formant and below the third formant, L/H SR was observed to decrease significantly following treatment. Increased CPP indicates increased dominance of harmonics in the spectrum following LSVT. Results: CPP and CPP SD increased significantly and CSID decreased significantly from pre- to post-treatment recordings, with strong effect sizes. Sustained vowels were analyzed for cepstral peak prominence (CPP), CPP standard deviation (CPP SD), low/high spectral ratio (L/H SR), and Cepstral/Spectral Index of Dysphonia (CSID) using the KAYPENTAX computer software. ![]() Methodology: Nine speakers with PD were examined in a pre-/post-treatment design, with multiple daily audio recordings before and after treatment. Purpose: This article examines cepstral/spectral analyses of sustained /α/ vowels produced by speakers with hypokinetic dysarthria secondary to idiopathic Parkinson’s disease (PD) before and after Lee Silverman Voice Treatment (LSVT®LOUD) and the relationship of these measures with overall voice intensity. ![]()
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