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The influence of a sensitive period on central auditory development in children with unilateral and bilateral
Anu Sharma1, Michael F Dorman, Andrej Kral
1Behavioral and Brain Sciences, University of Texas at Dallas, Dallas, TX, USA. anu.sharma@utdallas.edu
Insights
Children receiving cochlear implants early show better auditory development than those implanted later. This highlights a sensitive period for central auditory development in young children.
Area of Science:
- Neuroscience
- Audiology
- Developmental Pediatrics
Background:
- The development of the central auditory system is crucial for speech and language acquisition.
- Cochlear implantation is a common intervention for severe to profound hearing loss in children.
- A sensitive period for auditory development has been proposed, but its impact on cochlear implant outcomes requires further investigation.
Purpose of the Study:
- To investigate the longitudinal development of cortical auditory evoked potentials (CAEPs) in children with cochlear implants.
- To compare CAEP development in children implanted before or after a proposed sensitive period (3.5 years).
- To determine if the timing of cochlear implantation influences central auditory development.
Main Methods:
- Longitudinal study of 23 children (21 unilateral, 2 bilateral cochlear implants).
- CAEPs were measured to assess auditory pathway development.
- Children were categorized as early-implanted (<3.5 years) or late-implanted (>7 years).
Main Results:
- Early-implanted children demonstrated rapid development in CAEP morphology and P1 latency.
- Late-implanted children exhibited aberrant CAEP morphology and slower P1 latency improvements.
- Bilateral implantation timing also influenced CAEP development, with later implants showing delayed maturation.
Conclusions:
- A sensitive period for central auditory development exists in young children, impacting cochlear implant outcomes.
- Early cochlear implantation is associated with more typical CAEP development.
- Findings support the critical role of early intervention for optimal auditory development in children with hearing loss.
Abstract:
We examined the longitudinal development of the cortical auditory evoked potential (CAEP) in 21 children who were fitted with unilateral cochlear implants and in two children who were fitted with bilateral cochlear implants either before age 3.5 years or after age 7 years. The age cut-offs (<3.5 years for early-implanted and >7 years for late-implanted) were based on the sensitive period for central auditory development described in [Ear Hear. 23 (6), 532.] Our results showed a fundamentally different pattern of development of CAEP morphology and P1 cortical response latency for early- and late-implanted children. Early-implanted children and one child who received bilateral implants by age 3.5 years showed rapid development in CAEP waveform morphology and P1 latency. Late-implanted children showed aberrant waveform morphology and significantly slower decreases in P1 latency postimplantation. In the case of a child who received his first implant by age 3.5 years and his second implant after age 7 years, CAEP responses elicited by the second implant were similar to late-implanted children. Our results are consistent with animal models of central auditory development after implantation and confirm the presence of a relatively brief sensitive period for central auditory development in young children.
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