Hypophonia is soft speech, especially resulting from a lack of coordination in the vocal musculature. This condition is a common presentation in Parkinson's disease. This condition is generally treated with voice training programs, use of shorter sentences, breathing exercises, and muscle training exercises for vocal cords.
- "Hypophonia". Online Medical Dictionary. Retrieved 2012-06-05.
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- Lombard LE, Steinhauer KM. "A novel treatment for hypophonic voice: Twang therapy". J Voice. 21 (3): 294–9. doi:10.1016/j.jvoice.2005.12.006. PMID 16527452.
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