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Speech intelligibility index (SII) and sentence recognition in noise: a study in elderly with and without cognitive disorders users of hearing aids

Grant number: 16/13847-0
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): November 01, 2016
Effective date (End): October 31, 2017
Field of knowledge:Health Sciences - Speech Therapy
Principal researcher:Maria Cecilia Martinelli
Grantee:Erica Antero da Silva
Home Institution: Escola Paulista de Medicina (EPM). Universidade Federal de São Paulo (UNIFESP). Campus São Paulo. São Paulo , SP, Brazil


The Speech Intelligibility Index (SII) is highly correlated with the audibility of speech (ANSI, 1997). The SII score varies from 0% to 100%. A value of 0% indicates that no sound of speech is audible, while a value of 100% indicates that all speech sounds are audible. The SII is used in the clinical audiological practice to verify the adjustments of the hearing aids, in that pre -determined targets acoustic gain look be achieved and since this adjustment is to quantify the percentage of speech signals to which the patient has access. It is known that not all the speech sounds are audible even with amplification according to the degree and classifications of hearing loss. When fitting an amplification system it has been designed to provide speech sounds audibility. However what each individual will do with this information will depend on many aspects such as cognitive processes, cultural level, among others. PURPOSE: Investigate the effects of cognitive processes and SII in speech recognition in noise among elderly with and without cognitive disorders. METHOD: 40 elderly, hearing aids users, will be selected, 20 with suggestive cognitive impairment results and 20 without evidence of cognitive impairment, with bilateral moderate sensorineural hearing loss . Participants will initially be submitted to the verification procedure, visible speech mapping amplified and obtained the Speech Intelligibility Index (SII). Such data will quantify in percentage, the audibility of speech sounds. It will be also measured the maximum output of the hearing aid with tone burst at 85 dB SPL. Next, the elderly will be submitted to the Sentences List test in Portuguese (LSP) proposed by Costa in 1998. This test provide the signal/noise ratio where the patient can recognize 50% of the sentences presented in a 65 dB SPL speech spectrum noise After data collection the results will be submitted to statistical analysis.

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