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Amplitude Modulation Detection and Speech Recognition in Late-Implanted Prelingually and Postlingually Deafened

Anke M De Ruiter1, Joke A Debruyne, Michelene N Chenault

  • 11Department of Otorhinolaryngology, Head and Neck Surgery, Maastricht University Medical Center, Maastricht, The Netherlands; 2Adelante, Centre of Expertise in Rehabilitation and Audiology, Hoensbroek, The Netherlands; 3School for Mental Health and Neuroscience, Maastricht University, Maastricht, The Netherlands; 4Department of Methodology & Statistics, Maastricht University, Maastricht, The Netherlands; and 5KU Leuven Department of Neurosciences, ExpORL, Leuven, Belgium.

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Summary

Cochlear implant users deafened before acquiring language have poorer temporal processing than those deafened after. Better temporal envelope processing in cochlear implant recipients correlates with improved speech understanding.

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Area of Science:

  • Neuroscience
  • Audiology
  • Speech-Language Pathology

Background:

  • Late-implanted prelingually deafened cochlear implant (CI) patients often struggle with open-set speech understanding.
  • Temporal-envelope information is crucial for speech perception.
  • Understanding temporal processing differences between pre- and postlingually deafened CI users is essential for improving speech recognition.

Purpose of the Study:

  • To compare temporal-envelope processing abilities in late-implanted prelingually and postlingually deafened CI users.
  • To investigate the relationship between temporal processing skills and speech recognition performance in these groups.

Main Methods:

  • Amplitude modulation detection thresholds were measured at various frequencies in prelingually (n=8) and postlingually (n=18) deafened CI users.
  • Speech recognition was assessed using phoneme (CNC), word, and speech tracking tests.
  • Temporal Modulation Transfer Functions (TMTFs) were analyzed for sensitivity and attenuation rates.

Main Results:

  • Prelingually deafened CI users exhibited significantly lower sensitivity and steeper attenuation rates in their TMTFs compared to postlingually deafened users.
  • Prelingually deafened CI users could not detect modulations at 150 and 200 Hz.
  • Strong correlations were observed between amplitude modulation detection and speech recognition scores across all CI users, particularly at lower modulation frequencies for the prelingually deafened group.

Conclusions:

  • Prelingually deafened CI users demonstrate impaired temporal modulation sensitivity, impacting their speech understanding.
  • Enhanced temporal processing abilities, especially at low modulation frequencies, are strongly linked to better speech recognition in CI users.
  • These findings highlight the need for targeted auditory rehabilitation strategies for prelingually deafened CI recipients.