Comparison of Pitch-Matching Methods to Predict Interaural Mismatch in Cochlear-Implant Users
* Presenting author
Bilateral cochlear implant (CI) users often experience interaural mismatch in place-of-stimulation which can limit sensitivity to spatial cues. There is no efficient way of estimating the degree of interaural mismatch. Changes in place-of-stimulation are associated with change in pitch for CI users. Therefore, our laboratory uses two pitch-matching methods to estimate interaural mismatch: pitch magnitude estimation (PME) and direct pitch comparison (DPC). PME involves rating pitch from 1 (lowest) to 100 (highest) for even numbered electrodes in each ear. DPC involves comparing the pitch of one electrode against six electrodes in the opposite ear. DPC is thought to provide more accurate predictions of matched place-of-stimulation electrodes, but is relatively slow because interaural pairs are chosen one at a time. PME is a much faster, global estimate of the relative difference of interaural electrodes, but it is uncertain whether PME can predict the same interaural pairs as DPC. Here, we predict DPC estimates from PME results using regression techniques. Results suggest PME may be an efficient tool for creating clinical maps for matched place-of-stimulation across the ears, potentially increasing sensitivity to spatial cues.Work supported by NIH-NIDCD R01-DC003083 to RYL, NIH-NIDCD R03-DC015321 to AK, and NIH-NICHD U54HD090256 to the Waisman Center.