RESUMO
New procedure of vowel acoustic space (VAS) (of vowel acoustic triangles) transformation for the purpose of characterization of vowel production in individuals with long-term hearing loss (HL) was developed. OBJECTIVE: To characterize VAS of adult Russian speakers with long-term HL using newly developed acoustic indicators. MATERIAL AND METHODS: Recordings of sustained Russian cardinal vowels /a/, /i/, /u/ of 10 women and 10 men with long-term HL were acoustically analyzed. For each participant, two first formants of each vowel were measured and log-transformed (logF1, logF2). VAS was transformed into right triangles, their /u/ corners were moved to the origin, and their legs were aligned with axes. VAS was almost symmetrical, equal and have a maximum size in the control group consisted of subjects without hearing impairment while these of long-term HL group VAS size tended to have reduced and VAS stretched along one axis. RESULTS: Our study showed that a new VAS normalization approach can distinguish at least three groups of people with long-term HL. CONCLUSION: There are those with vowel triangles stretched along logF1-axis, with vowel triangles stretched along logF2-axis, and with symmetrical vowel triangles. Causes of the VAS differences require further investigation.
Assuntos
Surdez , Perda Auditiva , Acústica , Adulto , Feminino , Perda Auditiva/diagnóstico , Humanos , Masculino , Fonética , Federação Russa , Acústica da FalaRESUMO
The effects of septoplasty and sinus lifting simulation in rats on changes in the frequency domain of heart rate variability were compared. In the early postoperative period, the low-frequency component increases, and the high-frequency component decreases. The VLF range also increased. This indicates an increase in the activity of the sympathetic nervous system and a shift in metabolism under the influence of post-surgical inflammation.
