The Binaural Interaction Component of the Auditory Brainstem Response Under Precedence Effect Conditions.
Kelly Dean, John H Grose
PMID 32808860WHAT IT FOUND
In ten normal-hearing adults, the brainstem response to an echo disappeared when a leading sound preceded it by 8.4 ms.
This suggests binaural processing in the brainstem contributes to how we suppress echoes and localize sound.
Key findings
01The binaural interaction component elicited by the lagging click pair was obliterated when presented together with the leading click pair.
02The most robust binaural interaction component was obtained for the diotic click pair presented alone.
03The presence of the leading clicks prolonged the latency of the response to the lagging clicks but did not reduce amplitude.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The study included only ten participants, all with normal hearing, so the findings may not apply to patients with hearing loss or auditory processing disorders. The results are based on specific stimulus parameters (8.4 ms delay, 400 µs ITD) and may not generalize to other temporal or spatial configurations. The study did not include a control group or compare patients to healthy individuals.
Declared interests
The paper is supported by the National Institutes of Health. No conflicts of interest are declared in the provided text.
The easy way to misread this
Do not interpret the disappearance of the echo response as a sign of pathology. This was a finding in healthy adults and reflects normal brainstem processing of precedence effects.