Naslov
Akustičke karakteristike glasova djece s motoričkim oštećenjima
(Acoustic features of voice of children with motor speech disorders)

Autori
Bolfan-Stošić, Natalija ; Farago, Emica

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
2nd International workshop of Models and analysis of vocal emissions for biomedical applications / Manfredi, Claudia - Firenza : München : University degli Studi di Firenze, 2001

Skup
2nd International workshop of Models and analysis of vocal emissions for biomedical

Mjesto i datum
Firenca, Italija, 13.09.2001. - 15.09.2001

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
jitter; shimmer; osnovna frekvencija; omjer signal/sum; kvaliteta glasa; cerebralna paraliza; akusticka analiza
(jitter; shimmer; fundamental frequency; harmonic to noise ratio; voice)

Sažetak
Aronson (1980) said that voice disorder characterised by distorted voice quality, pitch and intensity and determined by age, sex or cultural group. Voices of children with cerebral palsy are hoarse, vary and tense (Bolfan-Stošić, 1999). Phenomenon like "antiresonans" or absorbed air energy, because of loss of energy through open nasal tract, characterised voices of children with dysarthria (Lindblom, B. E. F., et al., 1977). According to Kent et al. (1979) acoustical characteristics of dysarthria indicate problem of time control in duration of speech segments. Zwirner and Barnes (1992) found out significant higher values between dysarthric and control group in Fo variability and they think that impairments of muscle control including laryngeal function, should be evaluate differ than disorders of upper air transmission like tongue, mouth, velum and jaw. They agree that dysarthria is a speech disorder of motoric control caused by central or peripheral neurological system including respiratory, phonation and jaw problems (Aronson, 1985 ; Darley, Aronson, Brown, 1975). Motoric disorders among children population are manifested in different ways in the field of speech - linguistic ability. There is a small number of researches in Croatia on the disorders at the level of speech expression, i.e. on the analysis of the quality of the voice of this population. The sample of this research were seven children with neuro-motoric disorders (of both sexes- 3 girls and 4 boys). Acoustic analysis of voice parameters, representing variables in this research (fundamental frequency, jitter, shimmer, harmonic to noise ratio as well as maximum duration of the vowel /a/) has been made by using EZ Voice Plus program for voice analysis. The results of correlation matrix obtained by Statistica for Windows Ver.4.0 show significant negative correlation between frequency of laryngeal tone and jitter, and HNR and jitter. Acoustic analysis of the phonation of the vowel /a/ of this group shows great deviation of the voice from the normal, which points to the problem of non-development of voice quality in motoric disorders group mainly resulting from neglected therapy of speech and voice. Boone (1989) considers pathological phonation shorter than 5 sec. For this population, it must be taken explanation of vowel production performances as a short and very hard to produce with small amount of energy. Wit et al. (1993) said that this kind of phonation task is a strong way for identification of spastic dysarthria. Higher values of Fos (see Figures 3 and 4), in reference to the age and sex of the questioned, seem to point mainly to the hypertension of vocal mechanisms for voice phonation and to a significant deviation of the higher noise presence from the normal. The last one indicates neurological disorders and functional dysphonia. We hope we will motivate professionals from practice, with this kind of research, to make better speech and voice therapy strategies in developing voice quality of this population.

Izvorni jezik
Engleski

POVEZANOST RADA