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Intra- and interindividual correlations between auditory evoked potentials and speech perception in cochlear implant
M J Makhdoum1, P A Groenen, A F Snik
1Department of Otorhinolaryngology, University Hospital Nijmegen, The Netherlands. M.Makhdoum@KNO.AZN.NL
Scandinavian Audiology
|March 20, 1998
Summary
Electrically evoked auditory brainstem response (EABR) and middle latency response (EMLR) amplitudes correlate, but not with speech perception. However, late latency response (EALR) amplitude and latency show a significant relationship with speech outcomes in cochlear implant users.
Area of Science:
- Audiology
- Neuroscience
- Biomedical Engineering
Background:
- Electrophysiological measures like EABR, EMLR, and EALR supplement behavioral assessments for cochlear implant efficacy.
- Understanding the interdependencies of these responses is crucial for optimizing cochlear implant outcomes.
Purpose of the Study:
- To investigate intercorrelations between EABR, EMLR, and EALR in postlingually deaf subjects.
- To explore correlations between evoked potential peak amplitudes/latencies and long-term speech perception scores.
Main Methods:
- Combined EABR, EMLR, and EALR measurements were performed on 15 postlingually deaf individuals with Nucleus multichannel cochlear implants.
- Statistical analyses were used to assess intercorrelations between evoked potential parameters and speech perception scores.
Main Results:
- Significant correlations were observed between EABR (peak V amplitude) and EMLR (NaPa, NbPb amplitudes).
- No significant correlations were found between EABR/EMLR amplitudes and EALR amplitudes.
- EABR and EMLR amplitudes did not correlate with speech perception, while EALR peak amplitude showed a moderate correlation.
- EALR peak P2 latency, unlike earlier latencies, significantly related to speech perception scores.
Conclusions:
- Early electrophysiological responses (EABR, EMLR) show interdependencies but do not predict speech perception in cochlear implant users.
- Later electrophysiological responses, specifically EALR amplitude and latency, are more indicative of speech perception outcomes.
- EALR measurements may offer valuable insights into auditory function and rehabilitation success post-cochlear implantation.