What is it about?
Using headphones, we measured the smallest across-ear or interaural level differences that normal-hearing individuals can detect. The measurements were made over a large range of frequencies (low frequencies around 750 Hz, mid frequencies around 2000 Hz, and high frequencies around 4000 Hz). When remote frequency information was added with no across-ear differences (thus probing the across frequency processing of the binaural auditory pathways), the pattern of performance was non-monotonic, variable, and not predictable from our current knowledge of across-ear level difference processing.
Why is it important?
While much is known about how we localize sounds using across-ear timing differences, much less is known about across-ear level differences. This study is important for better understanding how the brain determines where sound sources come from in highly reverberant rooms (i.e., a large cathedral) or for those who use bionic auditory prostheses (i.e., cochlear implants).
Read the Original
This page is a summary of: Across-channel interaural-level-difference processing demonstrates frequency dependence, The Journal of the Acoustical Society of America, February 2018, Acoustical Society of America (ASA), DOI: 10.1121/1.5021552.
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