Sensitivity to pulse phase duration in cochlear implant listeners: Effects of stimulation mode

Monita Chatterjee, Aditya M. Kulkarni

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The objective of this study was to investigate charge-integration at threshold by cochlear implant listeners using pulse train stimuli in different stimulation modes (monopolar, bipolar, tripolar). The results partially confirmed and extended the findings of previous studies conducted in animal models showing that charge-integration depends on the stimulation mode. The primary overall finding was that threshold vs pulse phase duration functions had steeper slopes in monopolar mode and shallower slopes in more spatially restricted modes. While the result was clear-cut in eight users of the Cochlear CorporationTM device, the findings with the six user of the Advanced BionicsTM device who participated were less consistent. It is likely that different stimulation modes excite different neuronal populations and/or sites of excitation on the same neuron (e.g., peripheral process vs central axon). These differences may influence not only charge integration but possibly also temporal dynamics at suprathreshold levels and with more speech-relevant stimuli. Given the present interest in focused stimulation modes, these results have implications for cochlear implant speech processor design and protocols used to map acoustic amplitude to electric stimulation parameters.

Original languageEnglish (US)
Pages (from-to)829-840
Number of pages12
JournalJournal of the Acoustical Society of America
Volume136
Issue number2
DOIs
StatePublished - Aug 2014

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stimulation
sensitivity
pulses
stimuli
slopes
axons
animal models
thresholds
neurons
central processing units
Stimulation
Listeners
Cochlear Implant
Pulse
acoustics
excitation

ASJC Scopus subject areas

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics

Cite this

Sensitivity to pulse phase duration in cochlear implant listeners : Effects of stimulation mode. / Chatterjee, Monita; Kulkarni, Aditya M.

In: Journal of the Acoustical Society of America, Vol. 136, No. 2, 08.2014, p. 829-840.

Research output: Contribution to journalArticle

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