Discrimination of Voice Pitch and Vocal-Tract Length in Cochlear Implant Users.
Etienne Gaudrain, Deniz Başkent
PMID 28799983WHAT IT FOUND
Cochlear implant users need voice differences far larger than normal hearing listeners to tell speakers apart.
While pitch changes are still detectable, vocal tract length differences are not, meaning implants fail to convey the subtle cues used to identify who is speaking.
Key findings
01CI users required much larger differences in pitch and vocal tract length to distinguish voices compared to normal hearing listeners.
02Most CI users could not detect the typical vocal tract length difference between male and female voices.
03When identifying voices, CI users relied almost exclusively on pitch differences because vocal tract length cues were too degraded to be used.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The study included only 11 CI users, which limits the generalizability of the findings. The comparison group data came from a separate study using different participants, though the task was identical. The study used a single female speaker's voice for all stimuli, so results may not apply to all voice types. One participant had residual hearing in the non-implanted ear, which may have influenced pitch detection but not vocal tract length detection.
The easy way to misread this
Do not assume that CI users can distinguish speakers based on vocal tract length differences, as they generally cannot perceive these subtle spectral changes. The device's limited spectral resolution distorts these cues, making them unusable for voice identification.