ArticleThe Journal of the Acoustical Society of America2026
Low-frequency interaural time differences are resistant to across-frequency binaural interference across a range of overall levels.
Article in The Journal of the Acoustical Society of America, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Low-frequency interaural time differences (ITDs) are the primary human horizontal-plane localization cue. Across-frequency binaural interference tasks, which assess changes in ITD sensitivity in the presence of a remote interferer, reveal how listeners weigh binaural information across frequency regions. Low-frequency (0.5-kHz) targets experience less interference from high-frequency (4-kHz) interferers compared to the reverse, but the role of relative signal level across frequencies remains relatively underexplored. This study measured ITD discrimination thresholds in ten young normal-hearing listeners using target and interferer frequencies of 0.5, 4, and 8 kHz and levels of 35, 55, and 75 dB-A. Binaural interference magnitude depended on both stimulus level and frequency. For a 4-kHz target and 0.5-kHz interferer, interference significantly increased with increasing interferer and decreasing target levels. For a 0.5-kHz target and 4-kHz interferer, interference significantly increased with increasing interferer level when the target level was 35 dB-A, but was unchanged when the target level was 55 or 75 dB-A. The resistance to binaural interference for the low-frequency target at higher target levels confirms the robustness of low-frequency ITD processing and highlights the level-dependent vulnerability of high-frequency targets to interference. This helps advance understanding of spatial hearing for complex stimuli in more realistic auditory scenes.
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