The Relationship of Pitch Discrimination with Segregation of Tonal and Speech Streams for Cochlear Implant Users.
Andres Camarena, Matthew Ardis, Takako Fujioka and 2 others
PMID 39668613WHAT IT FOUND
Cochlear implant users did not use pitch differences to separate speech from competing talkers, though they separated tone streams similarly to people with no known hearing loss.
Key findings
01Cochlear implant users gained little masking release from pitch differences in competing speech, and pitch discrimination did not explain speech reception or masking release.
02Cochlear implant users' frequency and F0 discrimination thresholds were about eight times worse than those of people with no known hearing loss.
03Cochlear implant users separated tone streams similarly to people with no known hearing loss, and their F0 discrimination explained 43% of the variance in complex-tone stream segregation.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
Only 19 cochlear implant users and 17 people with no known hearing loss were tested. The cochlear implant group varied widely in age, implant company, hearing loss onset, and how they connected the implant to the computer. The cochlear implant users and controls were not age matched, with cochlear implant users averaging 57 years and controls averaging 44.2 years. Testing was done remotely, with headphones and different cochlear implant connections, so the results may not match a clinic or everyday listening. The authors noted that the pitch separations tested were 3, 6, and 12 semitones, and a narrower range near 0 to 3 semitones might have shown relationships more clearly. This was a listening experiment, not a treatment trial, so it cannot show that any therapy improves hearing in noise.
Declared interests
The authors declared no potential conflicts of interest. The work was supported by the National Institute on Deafness and Other Communication Disorders, grant 1 R01 DC018044.
The easy way to misread this
Do not conclude that better pitch discrimination will help cochlear implant users understand speech in competing talkers. The study found little masking release from pitch differences for CI users, and pitch discrimination did not explain speech reception or masking release.