Relationship among the physiologic channel interactions, spectral-ripple discrimination, and vowel identification in cochlear implant users

Jong Ho Won, Elizabeth Humphrey, Kelly Yeager, Alexis A. Martinez, Camryn H. Robinson, Kristen E. Mills, Patti Johnstone, Il Joon Moon, Jihwan Woo

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The hypothesis of this study was that broader patterns of physiological channel interactions in the local region of the cochlea are associated with poorer spectral resolution in the same region. Electrically evoked compound action potentials (ECAPs) were measured for three to six probe electrodes per subject to examine the channel interactions in different regions across the electrode array. To evaluate spectral resolution at a confined location within the cochlea, spectral-ripple discrimination (SRD) was measured using narrowband ripple stimuli with the bandwidth spanning five electrodes: Two electrodes apical and basal to the ECAP probe electrode. The relationship between the physiological channel interactions, spectral resolution in the local cochlear region, and vowel identification was evaluated. Results showed that (1) there was within- and across-subject variability in the widths of ECAP channel interaction functions and in narrowband SRD performance, (2) significant correlations were found between the widths of the ECAP functions and narrowband SRD thresholds, and between mean bandwidths of ECAP functions averaged across multiple probe electrodes and broadband SRD performance across subjects, and (3) the global spectral resolution reflecting the entire electrode array, not the local region, predicts vowel identification.

Original languageEnglish (US)
Pages (from-to)2714-2725
Number of pages12
JournalJournal of the Acoustical Society of America
Volume136
Issue number5
DOIs
StatePublished - Nov 1 2014

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vowels
ripples
discrimination
electrodes
spectral resolution
narrowband
interactions
cochlea
probes
bandwidth
Discrimination
Interaction
Spectrality
Cochlear Implant
stimuli
broadband
thresholds

All Science Journal Classification (ASJC) codes

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics

Cite this

Relationship among the physiologic channel interactions, spectral-ripple discrimination, and vowel identification in cochlear implant users. / Won, Jong Ho; Humphrey, Elizabeth; Yeager, Kelly; Martinez, Alexis A.; Robinson, Camryn H.; Mills, Kristen E.; Johnstone, Patti; Moon, Il Joon; Woo, Jihwan.

In: Journal of the Acoustical Society of America, Vol. 136, No. 5, 01.11.2014, p. 2714-2725.

Research output: Contribution to journalArticle

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