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Updated: Aug 24, 2025

Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
Published on: March 24, 2023
Phoneme Categorization in Prelingually Deaf Adult Cochlear Implant Users
Joseph Bochner1, Vincent Samar1, Emily Prud'hommeaux2
1National Technical Institute for the Deaf, Rochester Institute of Technology, NY.
Cochlear implantation before age 4 improves phoneme categorization (PC) skills in children with hearing loss. Early implantation aids speech recognition, even with less optimal PC performance.
Area of Science:
- Auditory Neuroscience
- Speech Perception
- Cochlear Implantation
Background:
- Phoneme categorization (PC) is crucial for speech understanding.
- Cochlear implants (CIs) aim to restore hearing for individuals with severe to profound hearing loss.
Purpose of the Study:
- To investigate phoneme categorization abilities in adult cochlear implant (CI) users with varying implantation ages.
- To compare PC performance between early (<4 years) and late (>7 years) implanted CI users and hearing controls.
Main Methods:
- Administered identification and discrimination tasks to assess PC.
- Analyzed data using principal component analysis to identify key performance factors.
- Correlated implantation age and PC performance with speech recognition outcomes.
Main Results:
- CI users showed generally poorer PC performance than hearing controls.
- Earlier CI implantation age correlated with better PC performance in the early implanted group.
- PC performance and implantation age had differential associations with speech recognition in early vs. late CI groups.
Conclusions:
- Implantation timing within the sensitive period (before 4 years) significantly impacts PC development.
- Early implantation may foster compensatory mechanisms for speech recognition, irrespective of PC proficiency.
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