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[Auditory brain stem responses in Down's syndrome]
Insights
Auditory brain-stem responses (ABR) in children with Down syndrome show normal central conduction times after maturation. This suggests earlier neurological development in infants with Down syndrome, contrary to previous findings.
Area of Science:
- Neuroscience
- Developmental Biology
- Audiology
Context:
- Down syndrome is a genetic disorder often associated with developmental delays.
- Auditory brain-stem responses (ABR) are crucial for assessing auditory pathway function.
- Previous research indicated prolonged central conduction times in individuals with Down syndrome.
Purpose:
- To investigate central auditory conduction times using ABR in children and young adults with Down syndrome and normal hearing.
- To compare ABR findings in Down syndrome populations with age-matched controls.
- To re-evaluate the impact of Down syndrome on neurological maturation.
Summary:
- This study recorded ABR from 81 children and 20 young adults with Down syndrome (all with normal hearing) and compared them to controls.
- While infants under 18 months with Down syndrome showed shorter I-V interpeak intervals, older children and adults did not, differing from prior studies.
- Findings suggest normal central conduction times post-CNS maturation in Down syndrome, with shortened times in infants possibly indicating accelerated neurological maturation.
Impact:
- Challenges the long-held view of universally prolonged central conduction times in Down syndrome.
- Suggests a potential for earlier neurological maturation in infants with Down syndrome.
- Provides new insights into auditory processing and neurological development in the Down syndrome population.
Abstract:
Auditory brain-stem responses (ABR) to click stimuli were recorded from 81 children and 20 young adults of Down's syndrome with normal hearing. Comparisons were made to groups of normal control subjects matched by age and sex. I-V interpeak interval in infants younger than 18 months was significantly shorter, while that in children over 18 months and young adults with Down's syndrome was not shortened, compared with that of each control group. Previous studies have emphasised that, regardless of age, the I-V interpeak interval in Down's syndrome is significantly shorter than in the control group. However our study suggests that cases of Down's syndrome with normal hearing have normal central conduction times after CNS maturation. And the shortened central conduction times in infants of Down's syndrome were not lesser than that of normal adults. Our results suggest that the shortened central conduction time in Down-syndrome infants is associated with earlier neurological maturation in Down's syndrome.