Individual Differences in the Recognition of Spectrally Degraded Speech: Associations With Neurocognitive Functions in Adult Cochlear Implant Users and With Noise-Vocoded Simulations.
Aaron C Moberly, Liping Du, Terrin N Tamati
PMID 39819389WHAT IT FOUND
Cognitive skills like reasoning and word retrieval help adults with cochlear implants understand degraded speech.
However, normal-hearing people listening to simulated implant speech use different cognitive strategies, so these simulations do not accurately reflect how actual implant users process sound.
Key findings
01Speed of lexical access and nonverbal reasoning were associated with better speech recognition in cochlear implant users.
02Normal-hearing participants listening to noise-vocoded speech showed different cognitive associations than implant users, particularly regarding audiovisual recognition.
03Noise-vocoded simulations may not adequately represent how neurocognition supports speech processing in actual cochlear implant users.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The neurocognitive tests used had not been formally checked for test-retest reliability in these specific populations. The number of trials in some tests was limited to keep the session under three hours, which may affect score precision. Audiovisual sentence recognition scores were very high (near ceiling) for both groups, making it difficult to detect cognitive associations. The groups had different baseline speech recognition abilities, which may have influenced which cognitive skills appeared relevant.
Declared interests
The work was supported by grants from the American Otological Society, the National Institutes of Health, and the Netherlands Organization for Scientific Research. No commercial conflicts of interest were reported.
The easy way to misread this
Do not assume that cognitive skills helping normal-hearing people understand simulated implant speech are the same skills helping actual cochlear implant users. The study found that implant users and simulation listeners relied on different cognitive mechanisms, especially when visual cues were present.