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Binaural interaction of bone-conducted auditory brainstem responses
M Setou1, T Kurauchi, T Tsuzuku
1Department of Otolaryngology. Faculty of Medicine, University of Tokyo, Japan.
Insights
Bilateral bone-conducted auditory brainstem responses (ABRs) demonstrate binaural interaction in normal hearing individuals. This finding provides neurophysiological evidence supporting sound lateralization abilities in children with congenital atresia.
Area of Science:
- Neuroscience
- Audiology
- Hearing Science
Background:
- Bone-conducted auditory brainstem responses (ABRs) are crucial for assessing hearing in children with congenital atresia.
- Previous research indicated that children with bilateral atresia possess binaural hearing abilities for sound lateralization using bilateral bone-conducted stimuli.
- Objective exploration of binaural interaction in bone-conducted ABRs is needed.
Purpose of the Study:
- To objectively investigate binaural interaction in bone-conducted ABRs in normal-hearing subjects.
- To provide neurophysiological evidence for sound lateralization capabilities in individuals with congenital ear abnormalities.
Main Methods:
- Recording bilateral bone-conducted auditory brainstem responses (ABRs).
- Utilizing monoaural stimulation to elicit responses.
- Analyzing responses in normal-hearing subjects to establish baseline binaural interaction.
Main Results:
- Binaural interaction was objectively identified in bone-conducted ABRs.
- The presence of binaural interaction in bone-conducted ABRs was confirmed.
Conclusions:
- Binaural interaction is a demonstrable phenomenon within bone-conducted ABRs.
- This neurophysiological evidence supports the capacity for sound lateralization in children with bilateral microtia and atresia.
Abstract:
Bone-conducted auditory brainstem responses (ABRs) elicited by monoaural stimulation are very useful for evaluating hearing in children with congenital atresia of both ears. In a previous study of sound lateralization in children with congenital atresia of both ears, using bilateral bone-conducted stimuli, we found that most of the children could sufficiently retain binaural hearing ability in terms of both intensity and time differences. In this study we attempted to record bilateral bone-conducted ABRs in normal subjects in order to explore binaural interaction objectively. The study revealed that binaural interaction exists in bone-conducted ABRs. This can be taken as neurophysiological evidence that sound lateralization can be detected by children with bilateral microtia and atresia.