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Brainstem auditory evoked response and subcortical abnormalities in autism.
J Thivierge1, C Bédard, R Côté
1Department of Psychiatry, Laval University, Quebec, Canada.
The American Journal of Psychiatry
|December 1, 1990
Summary
Autism neurobiology research shows abnormal brainstem auditory evoked responses in 80% of autistic children. An ipsilateral masking technique improved detection of higher brainstem abnormalities in these children.
Area of Science:
- Neuroscience
- Developmental Neuroscience
- Auditory Neuroscience
Background:
- Previous brainstem auditory evoked response (BAER) studies in autism yielded inconsistent findings.
- Understanding the neurobiological underpinnings of autism is crucial for developing effective interventions.
Purpose of the Study:
- To investigate autism neurobiology using BAER with enhanced methodologies.
- To compare BAER results in autistic children with those of mentally retarded children and age/sex-matched normal children.
Main Methods:
- Utilized brainstem auditory evoked response (BAER) with an ipsilateral masking procedure.
- Assessed 20 autistic children (DSM-III-R criteria) and 13 mentally retarded children (nonverbal IQ < 75).
- Compared subject results against age- and sex-corrected normative data from a large cohort of normal children.
Main Results:
- Eighty percent of autistic subjects exhibited abnormal interpeak latencies, significantly higher than the 15% observed in mentally retarded subjects.
- Prolonged interpeak latencies (I-V and III-V) were exclusively identified in the autistic group.
- The addition of ipsilateral masking doubled the detection rate of higher brainstem abnormalities in autistic children.
Conclusions:
- BAER, particularly with ipsilateral masking, is a sensitive tool for detecting higher brainstem abnormalities in autism.
- Abnormalities in brainstem auditory pathways are prevalent in autistic individuals.
- This study refines BAER methodology for improved diagnostic utility in autism research.