Frequency importance functions in simulated bimodal cochlear-implant users with spectral holes.
J Acoust Soc Am
; 155(6): 3589-3599, 2024 Jun 01.
Article
em En
| MEDLINE
| ID: mdl-38829154
ABSTRACT
Frequency importance functions (FIFs) for simulated bimodal hearing were derived using sentence perception scores measured in quiet and noise. Acoustic hearing was simulated using low-pass filtering. Electric hearing was simulated using a six-channel vocoder with three input frequency ranges, resulting in overlap, meet, and gap maps, relative to the acoustic cutoff frequency. Spectral holes present in the speech spectra were created within electric stimulation by setting amplitude(s) of channels to zero. FIFs were significantly different between frequency maps. In quiet, the three FIFs were similar with gradually increasing weights with channels 5 and 6 compared to the first three channels. However, the most and least weighted channels slightly varied depending on the maps. In noise, the patterns of the three FIFs were similar to those in quiet, with steeper increasing weights with channels 5 and 6 compared to the first four channels. Thus, channels 5 and 6 contributed to speech perception the most, while channels 1 and 2 contributed the least, regardless of frequency maps. Results suggest that the contribution of cochlear implant frequency bands for bimodal speech perception depends on the degree of frequency overlap between acoustic and electric stimulation and if noise is absent or present.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Percepção da Fala
/
Estimulação Acústica
/
Implantes Cocleares
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Estimulação Elétrica
/
Ruído
Limite:
Adult
/
Humans
Idioma:
En
Revista:
J Acoust Soc Am
Ano de publicação:
2024
Tipo de documento:
Article
País de afiliação:
Estados Unidos