![]() ![]() voice tremor, 8 and spastic dysarthria associated with amyotrophic lateral sclerosis.9., 10. Traditional acoustic analyses including fundamental frequency, jitter, shimmer, and noise-to-harmonic ratio analyses have differentiated normal subjects from those with spasmodic dysphonia,4., 5., 7. 4 For example, the characteristic strained and strangled voice of the individual with adductor spasmodic dysphonia may also be found in other neurologic disorders, including Parkinsonism, cerebellar ataxia, Huntington's disease, and essential tremor.5., 6. Furthermore, they may present as part of an underlying neurologic disorder or as a result of vocal misuse, as may be seen in some cases of muscular tension dysphonia. Spastic, spasmodic, and tremulous vocal qualities may occur in isolation or present as part of a more central speech disturbance. 2 However, these vocal qualities have been difficult to analyze through traditional acoustic measures because of their inconsistent and variable presentation that may further vary as individuals develop changing compensatory strategies to vocalize. ![]() The ability to objectively characterize vocal qualities like spastic, spasmodic, and tremulous may aid in differentiating one from the other, aid in quantifying the severity level, and provide a basis for monitoring the effects of treatments. ![]() 1 These characteristics may be found in neurologically and functionally based voice disorders. Strained, strangled, and tremulous vocal qualities may frequently sound similar and be difficult to differentiate. ![]()
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