Effects of phase duration and electrode separation on loudness growth in cochlear implant listeners

Monita Chatterjee, Qian Jie Fu, Robert V. Shannon

Research output: Contribution to journalArticle

35 Scopus citations

Abstract

Loudness estimates were obtained in a group of four adult subjects implanted with the Nucleus-22 multielectrode cochlear implant device, for a range of pulse amplitudes and different fixed phase durations and electrode separations. The stimulus was a 200-ms long train of biphasic pulses presented at 500 pulses/s. Subjects estimated loudness as a number from 0 ('don't hear it') to 100 ('uncomfortably loud'). Loudness was found to grow exponentially with pulse amplitude, at a rate that was dependent upon the phase duration as well as the electrode separation. An equation of the form L = e((λ+ γM))(DΘ)1, where L is the estimated loudness, M is the separation between electrodes of a stimulating pair, D is the phase duration, 1 is current amplitude, and λ, γ, and Φ are constants, appears to describe the observed data adequately. The findings are remarkably consistent across subjects. (C) 2000 Acoustical Society of America.

Original languageEnglish (US)
Pages (from-to)1637-1644
Number of pages8
JournalJournal of the Acoustical Society of America
Volume107
Issue number3
DOIs
StatePublished - Mar 2000

ASJC Scopus subject areas

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics

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