LAUSR

Cochlear implants (CI) for individuals with single-sided deafness (SSD) are generally programmed with a standard frequency-allocation table (FAT) to maximize the transmission of speech information through the CI. However, a standard FAT is likely to produce mismatch in interaural place of stimulation, which could limit the spatial-hearing benefits that SSD-CIs provide. This study compared three methods for estimating interaural mismatch for SSD-CI listeners: interaural-time-difference (ITD) discrimination, pitch discrimination, and computed-tomography (CT) scan estimates of electrode intracochlear position. For all three measures, the estimated matched acoustic frequency increased for subsequently more basal electrodes. The ITD-based and CT-based estimates were generally consistent with one another, and were on average about one octave above the standard FAT. The pitch-based estimates were considerably lower, averaging about a half-octave above the standard FAT. These results suggest that pitch-discrimina...