Harmonic Amplitude Differences Before and After Voice Treatment for Parkinson's Disease and Their Relationship to Voice Quality and Speech Intelligibility

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• Voice treatment significantly improves harmonic amplitude, enhancing overall voice quality.
• The study shows a direct relationship between harmonic amplitude and speech intelligibility in patients with Parkinson's disease.
• Analysis of voice samples before and after treatment highlights measurable gains in communicative effectiveness.
• Findings underscore the importance of voice therapy for improving speech outcomes in neurological conditions.