Cochlear implant patients' speech understanding in background noise: Effect of mismatch between electrode assigned frequencies and perceived pitch

W. Di Nardo, A. Scorpecci, S. Giannantonio, F. Cianfrone, C. Parrilla, G. Paludetti

Research output: Contribution to journalArticle

Abstract

Objective: To assess the electrode pitch function in a series of adults with postlingually implanted cochlear implants and with contralateral residual hearing, in order to investigate the correlation between the degree of frequency map mismatch and the subjects' speech understanding in quiet and noisy conditions.Design: Case series.Subjects: Seven postlingually deafened adults with cochlear implants, all with detectable contralateral residual hearing. Subjects' electrode pitch function was assessed by means of a pitch-matching test, in which they were asked to match an acoustic pitch (pure tones delivered to the non-implanted ear by an audiometer) to a perceived pitch elicited by stimulation of the cochlear implant electrodes. A mismatch score was calculated for each subject. Speech recognition was tested using lists of sentences presented in quiet conditions and at +10, 0 and 5dB HL signal-to-noise ratio levels (i.e. noise 10dB HL lower than signal, noise as loud as signal and noise 5dB HL higher than signal, respectively). Correlations were assessed using a linear regression model, with significance set at p2=0.91 and 0.89, respectively).Conclusion: The mismatch between frequencies allocated to electrodes and the pitch perceived on stimulation of the same electrodes could partially account for our subjects' difficulties with speech understanding in noisy conditions. We suggest that these subjects could benefit from mismatch correction, through a procedure allowing individualised reallocation of frequency bands to electrodes.

Original languageEnglish
Pages (from-to)828-834
Number of pages7
JournalJournal of Laryngology and Otology
Volume124
Issue number8
DOIs
Publication statusPublished - Aug 2010

Keywords

  • Cochlea
  • Implants And Prostheses
  • Sensorineural Hearing Loss
  • Speech Discrimination

ASJC Scopus subject areas

  • Otorhinolaryngology

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