VOCAL ONTOGENY OF CHUCK CALL IN SQUIRREL MONKEYS II PERCEPTION

学习是否有助于声乐的发展 在松鼠猴的感知，那么这将代表一个 灵长类动物声音发育与人类声音发育之间重要的相似之处 语言的发展，并可能提供一个重要的非人类灵长类动物 研究人类儿童语言发展的模型。 目标 我们对四个不同年龄段的受试者进行了实验， 在受控的条件下， 具有不同社会关系的无关个体。 使用回放 实验中，我们测试了假设，在不同的主题 发育阶段优先响应 社会关系密切但不相关的同伴相比， 社会群体内部或外部的其他个体。 结果亚成体的行为反应 优先于亲密伙伴但婴儿的chuck呼叫， 青少年和成年人没有。 青少年的行为反应 强烈地依赖于来自个人的查克呼叫的回放 在他们的殖民地内， 沉默 这些 结果表明，学习在chuck call中起作用， 研究表明， 学会用声音识别群体中的社交伙伴。 未来的方向需要进一步的研究来确定何时 语音识别的发展出现，以及性别差异是否 在松鼠猴的卡盘识别系统中发现， 婴儿、青少年的行为和声音反应， 从基因上不相关的成年人那里听到的。 关键词声乐学习，语言发展，语言进化， 生物声学分析

Significance If learning contributes to the development of vocal perception in the squirrelmonkey, then this will represent an important parallel between primate vocal development and human language development and may provide an important nonhuman primate model for studying language development in human children. Objectives We experimentally exposed subjects of four different age classes, under controlled conditions, to the chuck calls of genetically unrelated individuals of different social affinities. Using playback experimentation, we tested the hypothesis that subjects at different developmental stages respond preferentially to the chuck calls of socially close but unrelated companions when compared to those of other individuals either from within or outside of the social group. Results Results demonstrated that subadults behaviorally respond preferentially to the chuck calls of close associates but infants, juveniles, and adults do not. Juveniles behaviorally responded more strongly to the playback of chuck calls arising from individuals within their colony when compared to the playback of silence. These results demonstrate that learning plays a role in chuck call recognition in squirrel monkeys and suggest that infants gradually learn to recognize social companions vocally within their groups. Future Directions Further research is needed to determine when in development vocal recognition emerges and whether a sex difference is found in the chuck recognition system in squirrel monkeys by examining both behavioral and vocal responses from infants, juveniles, and subadults to chuck call playback from genetically unrelated adults. KEYWORDS vocal learning, language development, evolution of language, bioacoustic analysis