Cluster of Excellence Hearing4all, Animal Physiology and Behaviour Group, Department of Neuroscience, School of Medicine and Health Sciences, University of Oldenburg, D-26111 Oldenburg, Germany.
Behav Brain Res. 2013 Nov 1;256:669-76. doi: 10.1016/j.bbr.2013.08.038. Epub 2013 Sep 12.
Long signal durations that represent closed-loop conditions permit responses based on the sensory feedback during the presentation of the stimulus, while short stimulus durations that represent open-loop conditions do not allow for directed head turns during signal presentation. A previous study showed that for broadband noise stimuli, the minimum audible angle (MAA) of the European starling (Sturnus vulgaris) is smaller under closed-loop compared to open-loop conditions (Feinkohl & Klump, 2013). Head turns represent a possible strategy to improve sound localization cues under closed-loop conditions. In this study, we analyze the influence of head turns on the starling MAA for broadband noise and 2 kHz tones under closed-loop and open-loop conditions. The starlings made more head turns under closed-loop conditions compared to open-loop conditions. Under closed-loop conditions, their sensitivity for discriminating sound source positions was best if they turned their head once or more per stimulus presentation. We discuss potential cues generated from head turns under closed-loop conditions.
长信号持续时间表示闭环条件，允许根据刺激呈现期间的感觉反馈做出反应，而短信号持续时间表示开环条件，不允许在信号呈现期间进行定向转头。先前的一项研究表明，对于宽带噪声刺激，与开环条件相比，环条件下（Feinkohl & Klump，2013），欧洲椋鸟（Sturnus vulgaris）的最小可听角（MAA）更小。转头代表了在闭环条件下改善声音定位线索的一种可能策略。在这项研究中，我们分析了在闭环和开环条件下，转头对宽带噪声和 2 kHz 音调的椋鸟 MAA 的影响。与开环条件相比，椋鸟在闭环条件下进行了更多的转头。在闭环条件下，如果它们每发出一次刺激就转头一次或多次，那么它们对声源位置的辨别能力就最好。我们讨论了闭环条件下转头产生的潜在线索。
