Jurado Carlos, Grothe Benedikt, Drexl Markus
Audiology Group, Department of Neuromedicine and Movement Sciences, Norwegian University of Science and Technology, Trondheim, Norway.
Division of Neurobiology, Faculty of Biology, Ludwig-Maximilians-Universität in Munich, Martinsried, Germany.
PLoS One. 2025 Jun 30;20(6):e0327525. doi: 10.1371/journal.pone.0327525. eCollection 2025.
Intense low-frequency (LF) sound exposure transiently alters hearing thresholds and other markers of cochlear sensitivity, and for these changes the term 'Bounce phenomenon' (BP) has been coined. Under the BP, hearing thresholds slowly oscillate for several minutes involving both stages of hyper- and hyposensitivity and it is reasonable to assume that the perception of sounds at levels well above threshold will also be affected. Here, we evaluated the effect of the BP on auditory lateralisation in healthy human subjects. Sound lateralisation crucially depends on the processing of either interaural level- or time differences (ILDs and ITDs, respectively), depending on the spectral content of the sound. The ILD needed to perceive a virtual sound source in the middle of the head was tracked across time. Measurements were carried out without and with a previous exposure to an intense LF-sound in the left ear, to elicit the BP. In 65% of the recordings, significant time-variant deviations from the perceived midline were observed after cessation of the LF-sound. In other words, a binaural stimulus perceived in the middle moved perceptually to the side and often back to the middle after presentation of the intense LF-sound. This means that intense LF-sound exposure can lead to a biasing of ILD-based sound localisation.
强烈的低频(LF)声音暴露会短暂改变听力阈值和其他耳蜗敏感性指标,针对这些变化创造了“弹跳现象”(BP)这一术语。在BP情况下,听力阈值会在几分钟内缓慢振荡,涉及超敏和低敏两个阶段,可以合理推测,远高于阈值水平的声音感知也会受到影响。在此,我们评估了BP对健康人类受试者听觉定位的影响。声音定位关键取决于声音频谱内容,分别基于双耳声级差或时间差(分别为ILD和ITD)的处理。追踪了在头部中央感知虚拟声源所需的ILD随时间的变化。在左耳无前暴露和有先前强烈LF声音暴露以引发BP的情况下进行了测量。在65%的记录中,LF声音停止后观察到与感知中线的显著时变偏差。换句话说,在中央感知到的双耳刺激在强烈LF声音呈现后会在感知上移向一侧,且常常又回到中央。这意味着强烈的LF声音暴露会导致基于ILD的声音定位出现偏差。
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