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Psychometric functions and temporal integration in electric hearing

G S Donaldson1, N F Viemeister, D A Nelson

  • 1Department of Otolaryngology, University of Minnesota, Minneapolis 55455, USA. donal005@maroon.tc.umn.edu

The Journal of the Acoustical Society of America
|June 1, 1997
PubMed
Summary

Cochlear implant users showed significantly different temporal integration and psychometric functions compared to acoustic hearing. These differences, particularly steeper psychometric slopes, may indicate varying neural survival in cochlear implant patients.

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Area of Science:

  • Auditory Neuroscience
  • Biomedical Engineering
  • Signal Processing

Background:

  • Cochlear implants (CIs) aim to restore hearing by electrically stimulating the auditory nerve.
  • Understanding temporal processing is crucial for optimizing CI speech perception.
  • Previous research on temporal integration and psychometric functions in CI users is limited.

Purpose of the Study:

  • To characterize temporal-integration functions and psychometric functions for auditory detection in Nucleus 22-electrode CI users.
  • To compare these functions with those observed in acoustic hearing.
  • To investigate the relationship between temporal integration, psychometric function slopes, and neural survival indicators.

Main Methods:

  • Temporal-integration and psychometric functions were measured in eight CI users using trains of biphasic pulses.

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  • Stimuli varied in duration (0.44–630.4 ms) and pulse number (1–64 pulses) across 21 electrodes.
  • Data analysis focused on the slopes of these functions and their correlation with absolute threshold and dynamic range.

    • Main Results:

    • Temporal-integration function slopes were significantly shallower (mean 0.42 dB/doubling) than in acoustic hearing.
    • Psychometric function slopes were 2-20 times steeper than in acoustic listeners and varied widely across subjects and electrodes.
    • An inverse relationship was observed between temporal-integration and psychometric function slopes, consistent with the multiple-looks model.

    Conclusions:

    • CI users exhibit distinct temporal integration and detection characteristics compared to acoustic hearing.
    • Steeper psychometric function slopes correlate with higher absolute thresholds and narrower dynamic ranges, suggesting reduced neural survival.
    • These findings provide insights into the neural correlates of hearing perception with cochlear implants.