Perception of polyphony with cochlear implants for 2 and 3 simultaneous pitches

Richard T. Penninger, Eugen Kludt, Charles J. Limb, Marc Leman, Ingeborg Dhooge, Andreas Buechner

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Hypothesis: It was hypothesized that cochlear implant (CI) subjects would be able to correctly identify 1, 2, and 3 simultaneous pitches through direct electrical stimulation. We further hypothesized that the location on the implant array and the fundamental frequency of the pitches would have an impact on the performance. Background: "They gave me back speech but not music" is a sentence commonly heard by CI subjects. One of the reasons is that in music, multiple streams are frequently played at the same time, which is an essential feature of harmony. Current CI speech processors do not allow CI users to perceive such complex polyphonic sounds. Methods: In the present study, the authors assessed the ability of CI subjects to perceive simultaneous modulation frequencies based on direct electrical stimulation. Ten CI subjects were asked to identify 1, 2, and 3 simultaneous pitches applied on different electrodes using sinusoidal amplitude modulation. All stimuli were loudness balanced before the actual identification task. Results: Subjects were able to identify 1, 2, and 3 simultaneous pitches. The further the distance between the 2 electrodes, the better was the performance in the 2-pitch condition. The distance between the modulation frequencies had a significant effect on the performance in the 2-and 3-pitch condition. Conclusion: Subjects are able to identify complex polyphonic stimuli based on the number of active electrodes. The additional polyphonic rate pitch cue improves performance in some conditions.

Original languageEnglish (US)
Pages (from-to)431-436
Number of pages6
JournalOtology and Neurotology
Issue number3
StatePublished - Mar 2014
Externally publishedYes


  • Cochlear implants
  • Pitch perception
  • Polyphonic pitch perception
  • Rate pitch

ASJC Scopus subject areas

  • Otorhinolaryngology
  • Sensory Systems
  • Clinical Neurology


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