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Effect of speech processor program modifications on cochlear implant recipients' threshold and maximum acceptable

J C Sun¹, M W Skinner, S Y Liu

¹Washington University School of Medicine, St. Louis, Missouri, USA. sunj@medicine.wustl.edu

American Journal of Audiology

|January 26, 2000

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Adjusting cochlear implant settings impacts loudness perception. Practice with loudness judgments is crucial for stable hearing optimization in Nucleus 22 implant users.

Area of Science:

Audiology
Biomedical Engineering
Neuroscience

Background:

Cochlear implants (Nucleus 22) aim to restore hearing.
Optimizing speech processor electrical stimulation levels is key for functional hearing.
Understanding loudness perception is vital for patient satisfaction.

Purpose of the Study:

To investigate the relationship between electrical stimulation level adjustments and changes in hearing thresholds and maximum acceptable loudness levels (MALs).
To assess the impact of these modifications on hearing optimization for daily life in Nucleus 22 cochlear implant recipients.

Main Methods:

Five Nucleus 22 cochlear implant users participated.
Thresholds and MALs were measured on active electrodes over six weekly sessions.

Related Experiment Videos

Measurements were taken before and after speech processor program modifications.

Main Results:

One participant showed a significant threshold change post-modification.
Four participants exhibited significant changes in MAL post-modification.
MAL variability was higher than previously reported, possibly due to inexperience with loudness judgments.

Conclusions:

Modifications in electrical stimulation levels can significantly alter maximum acceptable loudness levels.
Cochlear implant recipients require adequate practice in making MAL judgments.
Sufficient practice is essential for a stable clinical estimation of the electrical dynamic range's upper boundary.