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Auditory brain-stem responses in the fragile X syndrome
T Arinami1, M Sato, S Nakajima
1Ibaraki Prefectural Colony Hospital, Japan.
American Journal of Human Genetics
|July 1, 1988
Summary
Fragile X syndrome (fra[X]) in males is associated with auditory brain-stem response (ABR) abnormalities. Prolonged interpeak latencies suggest central nervous system and brain-stem white matter dysfunction.
Area of Science:
- Neuroscience
- Genetics
- Audiology
Background:
- Fragile X syndrome (fra[X]) is a genetic disorder associated with intellectual disability.
- Auditory processing is often affected in individuals with neurodevelopmental disorders.
Purpose of the Study:
- To investigate auditory brain-stem response (ABR) characteristics in males with fragile X syndrome.
- To identify potential central nervous system dysfunction related to auditory pathways.
Main Methods:
- Recording auditory brain-stem responses (ABRs) in 12 males with fragile X syndrome.
- Analyzing ABR thresholds, absolute latencies, and interpeak latencies.
- Comparing results with a control group of age-matched males with normal intelligence.
Main Results:
- One subject presented with increased ABR thresholds, suggesting hearing impairment.
- Five subjects showed prolonged I-V interpeak latencies.
- The fragile X group exhibited significantly prolonged III-V and I-V interpeak latencies compared to controls, but not I-III.
Conclusions:
- The pattern of prolonged interpeak latencies in fragile X syndrome indicates predominant central nervous system dysfunction.
- Impaired brain-stem white matter functioning is likely involved in this syndrome.
- ABR analysis can reveal subclinical auditory pathway abnormalities in fragile X syndrome.