Related Experiment Videos
Speech perception as a function of electrical stimulation rate: using the Nucleus 24 cochlear implant system
A E Vandali1, L A Whitford, K L Plant
1The Cooperative Research Centre for Cochlear Implant, Speech and Hearing Research, East Melbourne, VIC, Australia.
Ear and Hearing
|January 2, 2001
Summary
Higher electrical stimulation rates (up to 1615 pulses per second per channel) did not significantly improve cochlear implant speech comprehension for most users. Individual results varied, suggesting personalized rate optimization may benefit some, while high rates can be undesirable.
Area of Science:
- Audiology
- Neuroscience
- Biomedical Engineering
Background:
- Cochlear implants (CIs) are vital for hearing restoration.
- Optimizing electrical stimulation parameters is crucial for CI efficacy.
- The impact of stimulation rate on speech perception in CIs requires further investigation.
Purpose of the Study:
- To evaluate the effect of different electrical stimulation rates on speech comprehension in CI users.
- To determine if increasing stimulation rates beyond 250 pulses per second per channel (pps/ch) improves speech understanding.
- To assess individual user variability in response to varying stimulation rates.
Main Methods:
- Compared three electrical stimulation rates: 250, 807, and 1615 pps/ch.
- Utilized a speech processing strategy with electrode selection similar to Spectral Maxima and Spectral Peak strategies.
- Conducted speech perception tests with five Nucleus 24 CI users over 21 weeks, including take-home experience and a repeated ABC evaluation protocol.
Main Results:
- No significant group performance differences were found between 250 and 807 pps/ch.
- The 1615 pps/ch rate resulted in significantly poorer group performance on some tests, influenced by one subject's results.
- Individual scores varied, with some subjects benefiting from different rates; a preference for lower rates (250 and 807 pps/ch) was reported.
Conclusions:
- For the tested strategy and system, higher electrical stimulation rates (up to 1615 pps/ch) generally did not enhance speech comprehension.
- Individualized adjustment of stimulation rate may yield perceptual benefits for some CI users.
- High stimulation rates can be detrimental, causing poorer performance or adverse effects like tinnitus in certain individuals.