Abstract
Interaural level differences (ILDs) are produced when sounds occur away from the midline. The attenuation at the ear that is farther from the source location is frequency dependent and sometimes non-monotonic, resulting in inconsistent ILDs across frequency. It is unclear how the binaural system processes inconsistent ILDs. Ten normal-hearing listeners were presented one or three narrowband noises that varied in center frequency. Consistent or inconsistent ILDs were applied to the bands and listeners were asked to perform a left-right discrimination task. Diotic level roving was introduced to diminish listeners’ ability to utilize monaural cues. Results show that thresholds were nearly frequency independent for one noise band. For three bands, thresholds became frequency dependent with the worst performance at 4 kHz, suggesting across-frequency ILD processing is a complex operation. These results have implications for people who do not heavily rely on low-frequency interaural time differences to localize ...
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