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.
- Ho, Aileen K. Ph.D.; Iansek, Robert M.B.B.S., Ph.D., F.R.A.C.F.; Bradshaw, John L. M.A., Ph.D., D.Sc (2001). "Motor Instability in Parkinsonian Speech Intensity". Neuropsychiatry, Neuropsychology & Behavioral Neurology 14 (2): 109–116.
- "Parkinson's Disease = Nonpharmacologic Treatments". We Move. Retrieved 2012-06-05.
- "Hypophonia in Parkinson’s disease".
- "A novel treatment for hypophonic voice: Twang therapy".
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