Characteristics of the Adaptation Recovery Function of the Auditory Nerve and Its Association With Advanced Age in Postlingually Deafened Adult Cochlear Implant Users.
Shuman He, Jeffrey Skidmore, Brittney L Carter
PMID 35139051WHAT IT FOUND
Advanced age was not associated with slower recovery from neural adaptation in the auditory nerve of cochlear implant users.
The amount of recovery decreased at higher pulse rates, but the speed of recovery remained stable across rates up to 2400 pps.
Key findings
01The study found no statistically significant association between advanced age and either the amount or the speed of neural adaptation recovery.
02The amount of neural adaptation recovery decreased significantly as the pulse rate increased from 500 to 2400 pps.
03The speed of neural adaptation recovery (time constants) did not change significantly with pulse rate up to 2400 pps.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The age distribution of participants was skewed, with the majority in their 60s and 70s and very few under 40 or over 80. This lack of spread may have made it difficult to detect an age effect if one exists. The study only tested one masker duration (100 ms) and one stimulation level (C level). Neural adaptation recovery is known to be affected by these parameters, so the results may not apply to other clinical settings. The study measured peripheral nerve response (eCAP) and did not directly measure speech perception performance, so it cannot confirm how these neural characteristics translate to functional hearing outcomes.
Declared interests
None declared.
The easy way to misread this
Do not conclude that aging has no effect on auditory nerve function based on this study. The null finding for age may be due to the limited age range of participants, most of whom were in their 60s and 70s, rather than proof that neural adaptation is unaffected by advanced age.