Towards improved measurements of bone conduction auditory brainstem responses in infants and adults: mitigation of stimulus artefact.
Aoi A Hunsaker, Kristin M Uhler, Kerry A Walker and 2 others
PMID 40047301WHAT IT FOUND
Adding electromagnetic shielding and a foam pad to bone conduction transducers reduced stimulus artefact by approximately 50% in adults and 33–78% in infants.
This allows clearer recording of early brainstem responses without altering the hearing threshold estimates.
Key findings
01In adults, the modified transducer reduced artefact amplitude in all 18 comparisons, decreasing mean artefact by approximately 50% across three stimulus conditions.
02In infants, artefact amplitude decreased significantly in the majority of comparisons, with reductions ranging from 33% to 78% depending on stimulus level.
03The modification did not significantly change Wave V latency or amplitude, meaning it reduces noise without distorting the neural response used for threshold estimation.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
Read the rest of this summary
You get three full summaries a month, free, and we do not ask for a card. Search, the TL;DRs and your library stay unlimited either way.
What it does not show
The sample size was small (6 adults, 13 infants), and the infant data comes from a subset of a larger group where some subjects were excluded due to software errors or movement. The study used a specific commercial transducer (B-81) and custom modifications; results may not generalize to other transducer models or off-the-shelf solutions. There was significant variability in how much the artefact reduced between individuals, suggesting that head shape and electrode placement still influence the outcome. The acoustic output was not perfectly identical between conditions; the modified transducer had slightly higher output at 500 Hz, which could confound comparisons at that specific frequency.
Declared interests
The authors declare no competing interests. The study was funded by the University of Washington and Children's Hospital Colorado.
The easy way to misread this
Do not assume this modification is ready for immediate clinical use as a standard of care. The study is a proof-of-concept with a small sample, and the custom application of shielding and pads requires careful validation to ensure it does not alter transducer calibration or safety.
Summarised by AI from the full paper, without a clinician reviewing it. Check it against the source before it changes what you do. Read it on PubMed →