Frequency discrimination with sequential or simultaneous stimulation in MED-EL cochlear implants.
Acta Otolaryngol
; 127(12): 1266-72, 2007 Dec.
Article
en En
| MEDLINE
| ID: mdl-17851932
ABSTRACT
CONCLUSION:
Amplitude weighting using the bell-shaped filter design within the OPUS speech processors allows the creation of pitches intermediate to those of two adjacent electrodes. This mechanism can be used for both sequential and simultaneous stimulation.OBJECTIVES:
This paper describes frequency discrimination experiments which are based on amplitude weighting of two adjacent electrodes. The effects of sequential versus simultaneous stimulation of the electrode pair were investigated. MATERIALS ANDMETHODS:
The experiment was performed using a laboratory system emulating the signal processing using bell-shaped filters in the MED-EL speech processors. The system transformed input files (wav-files) into the stimulation data stream which was transmitted to the implant via the OPUS processor coil. Pitch discrimination was assessed for up to three electrode pairs in each subject, using an adaptive test method. Results for sequential stimulation were collected in eight subjects, a comparison between sequential and simultaneous stimulation was made in five subjects.RESULTS:
Results show an average frequency discrimination of 8.8% for sequential stimulation and 11.2% for simultaneous stimulation, of the nominal test frequency. Frequency discrimination ability varied across subjects and test electrode pairs. The difference in performance between sequential and simultaneous stimulation was not statistically significant.
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Banco de datos:
MEDLINE
Asunto principal:
Discriminación de la Altura Tonal
/
Implantes Cocleares
Tipo de estudio:
Prognostic_studies
Límite:
Adult
/
Aged
/
Female
/
Humans
/
Male
/
Middle aged
Idioma:
En
Revista:
Acta Otolaryngol
Año:
2007
Tipo del documento:
Article
País de afiliación:
Austria