Visual Analog of Temporal Envelope Benefits Speech Processing in Cochlear Implant Users: A Pilot Functional Near-Infrared Spectroscopy Study on the Associations Between Audiovisual Benefit, Listening Environment, and Peripheral Neural Health.
Zi Gao, Yi Yuan, Christopher R Mueller and 3 others
PMID 40745450WHAT IT FOUND
For cochlear implant users, a pulsing visual sphere improved sentence scores in lower noise, from 27% to 50%, but not in quiet or louder noise.
Brain measures did not show a clear effect.
Key findings
01A moving sphere based on the speech envelope improved sentence repetition at SNR +10 dB compared with audio alone, but not in quiet or SNR +5 dB.
02Cortical additivity trends were not significant when participant variability was included in the model.
03Cochlear nerve health measures showed no clear association with cortical activity or visual benefit.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
Only 12 cochlear implant users were studied, and most were older adults, so the findings may not apply to younger or more diverse users. The study was a pilot, and the brain activity results were not significant once participant differences were included. Cognitive factors such as memory and attention were not controlled, so they could have influenced speech scores. The eCAP measures were taken at only three or four electrodes, and associations with brain activity were inconclusive.
Declared interests
The authors declared no conflicts of interest.
The easy way to misread this
Do not conclude that a pulsing sphere helps cochlear implant users in all listening environments. The benefit was found only at SNR +10 dB, not in quiet or SNR +5 dB, and the neural measures did not show a clear effect.