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Sensitivity to ITDs is important for sound localization. Normal-hearinglisteners benefit from across-frequency processing, as seen with improved ITDthresholds when consistent ITD cues are presented over a range of frequencychannels compared to when ITD information is only presented in a singlefrequency channel. This study aimed to clarify whether cochlear-implant (CI)listeners can make use of similar processing when being stimulated withmultiple interaural electrode pairs transmitting consistent ITD information.ITD thresholds for unmodulated, 100-pulse-per-second pulse trains were measuredin seven bilateral CI listeners using research interfaces. Consistent ITDs werepresented at either one or two electrode pairs at different current levels,allowing for comparisons at either constant level per component electrode orequal overall loudness. Different tonotopic distances between the pairs weretested in order to clarify the potential influence of channel interaction.Comparison of ITD thresholds between double pairs and the respective singlepairs revealed systematic effects of tonotopic separation and current level. Atconstant levels, performance with double-pair stimulation improved compared tosingle-pair stimulation, but only for large tonotopic separation. Comparisonsat equal overall loudness revealed no benefit from presenting ITD informationat two electrode pairs for any tonotopic spacing. Irrespective ofelectrode-pair configuration, ITD sensitivity improved with increasing currentlevel. Hence, the improved ITD sensitivity for double pairs found for a largetonotopic separation and constant current levels seems to be due to increasedloudness. The overall data suggest that CI listeners can benefit from combiningconsistent ITD information across multiple electrodes, provided sufficientstimulus levels and that stimulating electrode pairs are widely spaced.

Channel Interaction and Current Level Affect Across-Electrode Integration of Interaural Time Differences in Bilateral Cochlear-Implant Listeners