Cluster of Excellence "Hearing4all 2.0", Division for Animal Physiology and Behaviour, School of Medicine and Health Sciences, Department of Neuroscience, Carl von Ossietzky University of Oldenburg, 26129 Oldenburg, Germany.
Cluster of Excellence "Hearing4all 2.0", Division for Cochlea and Auditory Brainstem Physiology, School of Medicine and Health Sciences, Department of Neuroscience, Carl von Ossietzky University of Oldenburg, 26129 Oldenburg, Germany.
J Exp Biol. 2022 Mar 1;225(5). doi: 10.1242/jeb.243601. Epub 2022 Mar 11.
The mechanisms of sound localization are actively debated, especially which cues are predominately used and why. Our study provides behavioural data in chickens (Gallus gallus) and relates these to estimates of the perceived physical cues. Sound localization acuity was quantified as the minimum audible angle (MAA) in azimuth. Pure-tone MAA was 12.3, 9.3, 8.9 and 14.5 deg for frequencies of 500, 1000, 2000 and 4000 Hz, respectively. Broadband-noise MAA was 12.2 deg, which indicates excellent behavioural acuity. We determined 'external cues' from head-related transfer functions of chickens. These were used to derive 'internal cues', taking into account published data on the effect of the coupled middle ears. Our estimates of the internal cues indicate that chickens likely relied on interaural time difference cues alone at low frequencies of 500 and 1000 Hz, whereas at 2000 and 4000 Hz, interaural level differences may be the dominant cue.
声源定位的机制仍存在争议，尤其是主要使用了哪些线索，以及为什么。我们的研究提供了鸡（Gallus gallus）的行为数据，并将这些数据与感知物理线索的估计相关联。声音定位的锐度用方位角的最小可听角（MAA）来量化。纯音 MAA 分别为 500、1000、2000 和 4000 Hz 时的 12.3、9.3、8.9 和 14.5 度，宽带噪声 MAA 为 12.2 度，这表明具有出色的行为敏锐度。我们从鸡的头部相关传递函数中确定了“外部线索”。这些线索被用来推导“内部线索”，同时考虑到关于耦合中耳影响的已发表数据。我们对内部线索的估计表明，鸡可能仅在低频 500 和 1000 Hz 时依赖于耳间时间差线索，而在 2000 和 4000 Hz 时，耳间水平差可能是主要线索。
