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Acoustic characteristics of voice after severe traumatic brain injury
1Transitional Learning Center, Galveston, Texas 77553, USA.
Objectives/Hypothesis:
To describe the acoustic characteristics of voice in individuals with motor speech disorders after traumatic brain injury (TBI).
Study Design:
Prospective study of 100 individuals with TBI based on consecutive referrals for motor speech evaluations.
Methods:
Subjects were audio tape-recorded while producing sustained vowels and single word and sentence intelligibility tests. Laryngeal airway resistance was estimated, and voice quality was rated perceptually.
Results:
None of the subjects evidenced vocal parameters within normal limits. The most frequently occurring abnormal parameter across subjects was amplitude perturbation, followed by voice turbulence index. Twenty-three percent of subjects evidenced deviation in all five parameters measured. The perceptual ratings of breathiness were significantly correlated with both the amplitude perturbation quotient and the noise-to-harmonics ratio.
Conclusions:
Vocal quality deviation is common in motor speech disorders after TBI and may impact intelligibility.
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