Audiological and Demographic Factors that Impact the Precision of Speech Categorization in Cochlear Implant Users.
Sarah Colby, Michael Seedorff, Bob McMurray
PMID 36542839WHAT IT FOUND
Cochlear implant users with some acoustic hearing categorize stop sounds better than electric-only users.
However, for fricative sounds, those with hybrid implants and good residual hearing categorize worse than bimodal users, suggesting they may ignore implant cues that actually carry the information.
Key findings
01Acoustic-electric users showed steeper categorization slopes for stop voicing than electric-only users, even after controlling for age and device experience.
02For fricatives, hybrid users with better residual hearing in the implanted ear had shallower categorization slopes than bimodal users or hybrids with poorer hearing.
03Electric-only users with steeper categorization slopes performed better on word and sentence recognition, but this relationship was unclear or reversed for acoustic-electric users in quiet conditions.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The study is cross-sectional, so it cannot prove that the device configuration caused the categorization differences; groups differed in age and hearing loss history. Clinical speech recognition scores were not available for all participants, so the relationship between categorization and daily function was analyzed on a smaller subset. The categorization task used isolated words and pictures, which may not fully reflect how patients process speech in complex, real-world listening environments.
The easy way to misread this
Do not assume that preserving residual acoustic hearing in a hybrid implant always improves speech perception. For fricatives, patients with better residual hearing in the implanted ear actually categorized sounds less consistently, suggesting their acoustic hearing may interfere with their use of the implant's electrical cues.