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Pitch estimation by early-deafened subjects using a multiple-electrode cochlear implant.

P A Busby1, G M Clark

  • 1Department of Otolaryngology, University of Melbourne, Parkville, Victoria, Australia. p.busby@medoto.unimelb.edu.au

The Journal of the Acoustical Society of America
|January 21, 2000
PubMed
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Cochlear implant users often perceive pitch tonotopically, but individual differences exist. Longer deafness duration negatively impacts pitch perception and speech understanding, highlighting the importance of timely implantation.

Area of Science:

  • Audiology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Cochlear implants (Cochlear Limited) are vital for restoring hearing in profoundly deaf individuals.
  • Understanding pitch perception is crucial for optimizing cochlear implant function and speech intelligibility.
  • Individual variability in pitch perception can influence outcomes after cochlear implantation.

Purpose of the Study:

  • To investigate pitch perception in relation to electrode position within the cochlear implant array.
  • To examine the correlation between pitch perception, auditory deprivation duration, and speech perception abilities.
  • To assess the reliability of pitch estimation in cochlear implant users.

Main Methods:

  • Pitch estimation was performed on 18 subjects with early-onset deafness using a 22-electrode cochlear implant array.

Related Experiment Videos

  • Relationships between pitch perception, auditory deprivation, age at implantation, and speech perception scores (Bamford-Kowal-Bench sentences, monosyllabic words) were analyzed.
  • Pitch estimation reliability was confirmed by comparing it with loudness estimation.

    • Main Results:

    • A tonotopic pitch order was observed in 56% of subjects; a deviant but reliable order in 22%; and no discernible order in 22%.
    • Longer duration of deafness and later age at implantation were significantly associated with poorer pitch estimation.
    • Subjects lacking a tonotopic pitch order exhibited the lowest Bamford-Kowal-Bench sentence scores.

    Conclusions:

    • Pitch perception in cochlear implant users shows significant inter-subject variability, with a tonotopic organization present in over half of the participants.
    • Auditory deprivation duration and age at implantation are critical factors influencing pitch perception and subsequent speech understanding.
    • Early cochlear implantation may be crucial for optimizing pitch processing and speech perception outcomes.