颜林林 (2024-06-19 06:01):
#paper doi:10.1038/s41559-024-02420-w, Nature Ecology & Evolution, 2024, African elephants address one another with individually specific name-like calls. 这篇研究很有意思,作者通过对非洲象发出的声音及其行为进行分析,首次确认了非洲象能够使用个体特定的叫声来识别和称呼其他象。之所以开展这项研究,是因为作者作为生态学家,观察到非洲象拥有广泛的声音交流和丰富的社会关系,因此他推测大象很可能会给彼此起名字。于是他们录制了大象发出的声音,并使用随机森林等机器学习方法,将声音片段与该声音的接收对象建立联系,预测准确度达到27.5%,显著超过作为对照的随机声音的效果。更有趣的是,他们将声音回放给大象,并观察其反应,确认了当大象听到“自己的名字”时,它们会发出更大的叫声,并更快地向扬声器移动。作者认为,这项研究是一个“非常有希望的开端”,将“引出一系列可以研究的其他问题”,比如大象是否也会说出地点的名字,甚至会用第三人称谈论彼此,而这种称呼个体同类的社会需求,很可能会是语言起源的前身。
IF:13.900Q1 Nature ecology & evolution, 2024-Jun-10. DOI: 10.1038/s41559-024-02420-w PMID: 38858512
African elephants address one another with individually specific name-like calls
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Abstract:
Personal names are a universal feature of human language, yet few analogues exist in other species. While dolphins and parrots address conspecifics by imitating the calls of the addressee, human names are not imitations of the sounds typically made by the named individual. Labelling objects or individuals without relying on imitation of the sounds made by the referent radically expands the expressive power of language. Thus, if non-imitative name analogues were found in other species, this could have important implications for our understanding of language evolution. Here we present evidence that wild African elephants address one another with individually specific calls, probably without relying on imitation of the receiver. We used machine learning to demonstrate that the receiver of a call could be predicted from the call's acoustic structure, regardless of how similar the call was to the receiver's vocalizations. Moreover, elephants differentially responded to playbacks of calls originally addressed to them relative to calls addressed to a different individual. Our findings offer evidence for individual addressing of conspecifics in elephants. They further suggest that, unlike other non-human animals, elephants probably do not rely on imitation of the receiver's calls to address one another.
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