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Auditory brain-stem responses in infants with Down's syndrome
Insights
Infants with Down syndrome show distinct auditory brain-stem response patterns compared to typically developing infants. These differences in wave V latency suggest unique auditory pathway development and necessitate specific normative data for this population.
Area of Science:
- Neuroscience
- Developmental Pediatrics
- Audiology
Background:
- Auditory brain-stem responses (ABRs) are crucial for assessing auditory pathway function in infants.
- Down syndrome is associated with various developmental differences, including potential auditory processing variations.
Purpose of the Study:
- To investigate age- and intensity-dependent changes in auditory brain-stem responses (ABRs) in infants with Down syndrome.
- To compare ABR latency patterns between infants with Down syndrome and typically developing infants.
Main Methods:
- Auditory brain-stem responses to click stimuli were recorded from 38 infants with Down syndrome and 35 typically developing infants at 3, 6, and 12 months of age.
- Latency of wave V was analyzed across different age points and sound intensities.
Main Results:
- Infants with Down syndrome exhibited significantly different wave V latency compared to controls.
- Shorter absolute wave V latencies and steeper latency-intensity functions were observed in the Down syndrome group across age and intensity.
- These differences were particularly notable at 12 months of age.
Conclusions:
- Established normative ABR latency-intensity curves for typically developing infants are inadequate for infants with Down syndrome.
- Cochlear function may differ between infants with Down syndrome and normal infants by 12 months of age.
- This highlights the need for specialized audiological assessments in infants with Down syndrome.
Abstract:
Auditory brain-stem responses to clicks were recorded from 38 infants with Down's syndrome at the ages of 3, 6, and 12 months in an attempt to delineate age-dependent and intensity-dependent latency changes in this population. Comparisons were made with 35 normally developing infants at the same age levels. Significant wave V latency differences were observed between groups for both age and intensity, with the group with Down's syndrome showing, in general, shorter absolute wave V latency values across age and steeper latency functions across intensity. The implications of this study are as follows: (1) latency-intensity curves for normally developing infants will not serve adequately as normative values for infants with Down's syndrome, particularly at the age of 12 months, and (2) cochlear function in infants with Down's syndrome may differ from normal infants by the age of 12 months.