![]() ![]() The DSI quantitatively measures acoustic parameters, such as maximum phonation time, jitter, maximum frequency and minimum intensity that determine vocal quality, and by means of a normalized formula, a score is reported as the general status of the vocal quality ( 11). One of the acoustic assessments of vocal quality to determine impairments to this subsystem is dysphonia severity index (DSI). These accurate and sensitive instruments quantitatively and objectively report changes in the vocal tract and the articulatory organs in the early stages of neurological disorders ( 5, 8) hence, acoustic analysis can be applied to detect changes in the phonation subsystem and the vocal quality caused by neurological disorders ( 10). Of these, acoustic evaluations are widely used in non-invasive methods in clinical and research departments. Therefore, evaluation and investigation of this subsystem can be important in terms of early diagnosis and timely treatment of speech disorders in this progressive disease.ĭifferent methods, such as perceptual, acoustic, as well as aerodynamic and physiological evaluations, using computer and laboratory developed equipment, are used to evaluate phonation subsystem disorders ( 9). Consequently, problems in speech intelligibility and disturbance in the transmission of communication messages result in serious damage to verbal communication skills and the quality of life of an individual, including social, educational, and occupational life ( 1, 8). This subsystem, in the process of multiple sclerosis, by damages, such as loudness control, breathiness, harsh vocal quality, and pitch control affects the vocal quality and speech intelligibility ( 1, 7). Among the speech subsystems, the phonation subsystem shows more damage, especially in the early stages of the disease, than other subsystems ( 1, 4- 6). According to studies on speech features in progressive neurological diseases, each of the speech subsystems is affected by varying degrees from mild to severe ( 3, 4). A variety of speech problems are reported in 40% of people with MS ( 1, 3). Central nervous system involvement in the progression of MS, in addition to the development of motor disorders in organs, leads to speech problems by weakening the speech muscles, including palate, larynx, and tongue muscles ( 3). Multiple Sclerosis is a progressive autoimmune disease that affects the central nervous system ( 1, 2). One of the most common causes of speech impairment is multiple sclerosis (MS). The proper functioning of these subsystems is the result of the integration of uncountable neuro-cognition, neuromuscular, and musculoskeletal activities that results in the transmission of a communication message through intelligible speech any disturbance in this integration make problems for the function of speech subsystems and, consequently, speech intelligibility ( 2). ![]() Speech production is the functional result of a collection of speech subsystems, including respiratory, phonation, articulation, resonatory, and prosody ( 1). ![]() Multiple Sclerosis Voice Quality Phonation Speech 1. Also, dysphonia severity index, as a reliable tool, can detect vocal quality impairments in multiple sclerosis and can be a supplementary assessment tool for early detection of degenerative diseases. The findings of this study indicated that the MS group had worse vocal quality than the healthy group, which means they were at risk of voice and speech problems therefore, acoustic assessments can determine the vocal impairments of the disease at the early stages and prevent progression of vocal impairments with an appropriate treatment plan. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |