Place-Pitch Interval Perception With a Cochlear Implant.
Natalia Stupak, Ann E Todd, David M Landsberger
PMID 33606415WHAT IT FOUND
Cochlear implant users could hear pitch direction but not musical intervals.
They rated melodies as equally out-of-tune whether the notes were spaced correctly or distorted. This explains why music often sounds discordant to implant users despite good speech understanding.
Key findings
01CI users showed no significant sensitivity to changes in semitone spacing when rating the tuning of a familiar melody.
02CI users were able to correctly identify pitch direction (rising or falling contours) above chance levels using place cues.
03Single-sided deafened users performed well on the melody task with their normal ear but showed the same insensitivity to tuning when using their implant alone.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The study relied on pure tones to isolate place-pitch cues, which may not fully represent complex real-world music. Individual variability was high; some CI users showed slight sensitivity to tuning, though it was not consistent across the group. The study did not test simultaneous electrical stimulation strategies that might offer different pitch coding.
The easy way to misread this
Do not assume CI users cannot hear pitch at all. They can reliably identify whether a melody is going up or down (ordinal pitch); the deficit is specifically in perceiving the correct distance between notes (interval pitch), which makes music sound out of tune.