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Updated: Jun 19, 2026
Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
Published on: March 24, 2023
[Paediatric cochlear implantation in the critical period of the auditory pathway, our experience]
Paz Martínez-Beneyto1, Antonio Morant, María-Ignacia Pitarch
1Advanced Bionics Spain, Alicante, España. pazmabe@terra.es
Insights
Early cochlear implantation in children with profound hearing loss before age 4 significantly improves speech test performance. This highlights the critical period for auditory development and language acquisition in pediatric cochlear implant recipients.
Area of Science:
- Pediatric audiology
- Neuroplasticity
- Speech-language pathology
Background:
- A critical period exists for auditory pathway development, influencing plasticity and learning.
- Early cochlear implantation in prelingual deaf children during this period enhances language acquisition prognosis.
- This study emphasizes the importance of cochlear implantation before this sensitive developmental window closes.
Purpose of the Study:
- To demonstrate the significance of cochlear implantation before the critical period for auditory development concludes.
- To evaluate the impact of implantation timing on auditory performance in children with prelingual deafness.
Main Methods:
- Observational, longitudinal, retrospective study of 57 children with prelingual bilateral sensorineural hearing loss.
- Children received Advanced Bionics implants between 1998 and 2006.
- Analysis included audiometric thresholds, disyllabic word tests, open-set sentence recognition, and the Nottingham scale.
Main Results:
- No significant differences in audiometric thresholds were observed based on implantation age.
- Statistically significant differences (p<0.05) in speech test performance were found between children implanted before and after 4 years of age.
- The most substantial differences in auditory performance were noted around the 4-year mark.
Conclusions:
- Results align with existing literature indicating improved auditory performance with early cochlear implantation.
- A critical window for cochlear implantation appears to be around 4 years of age for optimal speech outcomes.
- Children over 4 years of age should still be considered for cochlear implantation despite observed differences.
Introduction:
Numerous experimental and clinical studies have suggested a critical or sensitive period in which the auditory pathway develops its greatest potential in terms of plasticity and learning. Early cochlear implantation performed in prelingual deaf children in this period provides a better prognosis for language acquisition. The aim of this study is to show the importance of cochlear implantation before this critical period ends.
Methods:
We conducted an observational, longitudinal, retrospective study of 57 children suffering profound prelingual bilateral sensorineural hearing loss who had received Advanced Bionics implants at our ENT department between June, 1998, and November, 2006. Data on their audiometric thresholds, the disyllabic word test adapted to children, open-set sentences recognition test and the Nottingham scale were analyzed.
Results:
The analysis of audiometric thresholds showed no differences between children receiving the implants at different ages. However, statistically significant differences (p<0.05) were found in speech tests between groups of children receiving the implants before and after 4 years of age.
Conclusions:
Our results are in line with other publications showing differences in auditory performance when comparing children with early implants versus children receiving the implants at a later age. We found the greatest differences at 4 years of age. Nevertheless, these findings should not exclude children over this age from implantation.