000			02713caa a2200217 4500
008			210629s9999 xx 000 0 und d
022			_a1808-8686
100			_aHemanth Narayan Shetty
245		0	_aEncoding of speech sounds at auditory brainstem level in good and poor hearing aid performers
260			_c2017
270			_aAll India Institute of Speech and Hearing, DepartmentofAudiology, Karnataka, India
270			_mhemanthn.shetty@gmail.com
300			_a512-522
490			_vVolume 83
520			_aIntroduction: Hearing aids are prescribed to alleviate loss of audibility. It has been reported that about 31% of hearing aid users reject their own hearing aid because of annoyance towards background noise. The reason for dissatisfaction can be located anywhere from the hearing aid microphone till the integrity of neurons along the auditory pathway.Objectives:To measure spectra from the output of hearing aid at the ear canal level and frequency following response recorded at the auditory brainstem from individuals with hearing impairment.Methods:A total of sixty participants having moderate sensorineural hearing impairment with age range from 15 to 65 years were involved. Each participant was classified as either Good or Poor Hearing aid Performers based on acceptable noise level measure. Stimuli /da/ and /si/ were presented through loudspeaker at 65 dB SPL. At the ear canal, the spectra were measured in the unaided and aided conditions. At auditory brainstem, frequency following response were recorded to the same stimuli from the participants.Results:Spectrum measured in each condition at ear canal was same in good hearing aid performers and poor hearing aid performers. At brainstem level, better F0 encoding; F0 and F1 energies were significantly higher in good hearing aid performers than in poor hearing aid performers. Though the hearing aid spectra were almost same between good hearing aid performers and poor hearing aid performers, subtle physiological variations exist at the auditory brainstem.Conclusion:The result of the present study suggests that neural encoding of speech sound at the brainstem level might be mediated distinctly in good hearing aid performers from that of poor hearing aid performers. Thus, it can be inferred that subtle physiological changes are evident at the auditory brainstem in a person who is willing to accept noise from those who are not willing to accept noise.
653			_aFrequency following response; Acceptable noise level; Hearing aid performer
700			_aManjula Puttabasappa
773			_aBrazilian journal of otorhinolaryngology
856			_uhttps://doi.org/10.1016/j.bjorl.2016.06.004
942			_cFJAS _yFJAS
999			_c17741 _d17741