Voice onset time praat3/10/2023 ![]() The clinical aim of the analysis of voice onset time in speech motor disorder is to establish a correlation between voice abnormalities and phonetic disorder. Disorder at the voice onset time and the overlap patterns between voiced and voiceless sounds in MS patients show that the nature of production error is more phonetic, and these errors are related to defects in the timing of the production process ( 9). The results of these studies indicate that patients have problems in coordinating larynx and upper larynx mechanisms, which are due to speech motor control ( 6- 8).ĭue to turbulent breathing, pitch variation, and voice quality, VOT is affected in MS patients with spastic dysarthria. For example, Hardcrestle et al., in 1985, Maurice et al., in 1989, and Stanovich et al., in 2007, reviewed speech timing in patients with dysarthria. Voice onset time in neurological diseases has been studied in various studies. Since speech timing is determined directly by the central nervous system, it creates sophisticated acoustic communication between mechanical and neurological factors that play a crucial role in speech motor coordination as well as coordination between laryngeal and upper larynx mechanisms, such as production, stress, phonation, and respiration ( 2- 5). This means that VOT varies with the tongue moving up and down, or back and forth. ![]() lung capacity, movement of the tongue and the lips, duration of time of movement, and changes in speech speed). The parameter is influenced by various factors such as physiological and aerodynamic changes (e.g. ![]() This parameter is one of the important issues in the disordered timing of speech sound production, which indicates the time between air release in the pronunciation of a stop consonant and the onset of regular vibrations of vocal cords ( 1). Voice onset time is one of the acoustic indicators used in speech motor control. Multiple Sclerosis Dysarthria Voice Onset Time Place of Articulation 1. Deficient speech production timing causes problems in speech motor control and ultimately changes the speech of the affected people. Patients with MS differ in their motor coordination between articulator structures and speech structure compared to the healthy group.
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