Neurobiology of Social Communication, Department of Otolaryngology - Head and Neck Surgery, Medical Center, University of Tübingen, 72076 Tübingen, Germany.
Werner Reichardt Centre for Integrative Neuroscience, University of Tübingen, 72076 Tübingen, Germany.
Sci Adv. 2021 Jun 30;7(27). doi: 10.1126/sciadv.abf2938. Print 2021 Jun.
The vocal behavior of human infants undergoes marked changes across their first year while becoming increasingly speech-like. Conversely, vocal development in nonhuman primates has been assumed to be largely predetermined and completed within the first postnatal months. Contradicting this assumption, we found a dichotomy between the development of call features and vocal sequences in marmoset monkeys, suggestive of a role for experience. While changes in call features were related to physical maturation, sequences of and transitions between calls remained flexible until adulthood. As in humans, marmoset vocal behavior developed in stages correlated with motor and social development stages. These findings are evidence for a prolonged phase of plasticity during marmoset vocal development, a crucial primate evolutionary preadaptation for the emergence of vocal learning and speech.
人类婴儿的发声行为在其第一年中会发生显著变化，变得越来越像说话。相反，人们一直认为非人类灵长类动物的发声发展在出生后的头几个月内基本是预定的和完成的。与这一假设相反，我们发现狨猴的叫声特征和叫声序列的发展存在二分法，这表明经验可能起作用。虽然叫声特征的变化与身体成熟有关，但叫声之间的序列和转换在成年之前仍然具有灵活性。与人类一样，狨猴的发声行为分阶段发展，与运动和社会发展阶段相关。这些发现证明了狨猴发声发展具有延长的可塑性阶段，这是灵长类动物在发声学习和言语出现方面的一个关键进化前适应。
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