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Early vocal development in human and chimpanzee infants Shozo Kojima 1 1Faculty of Letters, Keio University Keyword: Ollerの段階的音声発達理論 , 喃語 , ヒト乳幼児 , チンパンジー乳幼児 pp.667-674
Published Date 2003/10/10
DOI https://doi.org/10.11477/mf.1431100349
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 The early development of vocal behaviors in human infants was described, and was compared with that of chimpanzee infants. The vocal behaviors of human infants develop in stages. At the age of about 1 year, the typical infant acquires the first word of spoken language. Although human infants usually do not utter words during the first year of life, they do develop a capability to produce the kinds of sounds that are found in words during this period. Oller(1980)and Stark(1980)have proposed similar stage theories describing the development of vocal behavior of human infants leading to the first word of spoken language. According to Oller's analyses of non-crying utterances, there are five stages of vocal development in human infants. These stages include Phonation(0-1months of life[mo]), Goo(2-3mo), Expansion(4-6mo), Canonical babbling(7-10mo)and Variegated babbling(11-12mo). There are characteristic non-reflexive vocalization types for each stage. For example, quasi-resonant nuclei in the Phonation stage, Goo in the Goo stage, fully resonant nucleus, raspberry and others in the Expansion stage, canonical babbling in the Canonical stage and variegated babbling and gibberish in the Variegated Babbling stage.

 Chimpanzee infants rarely emitted non-crying vocalizations spontaneously. Rather, the vocalizations were almost always elicited by environmental stimuli. A similar time course for the elicitability of vocalization was observed in human and chimpanzee infants. The elicitation of vocal behaviors of human and chimpanzee infants first increased, and then decreased. Thus, this aspect of vocal behavior in the chimpanzee infant and human infants may have a common basis. However, there were differences between the chimpanzee and human infants. Although human infants increased spontaneous vocalizations, the chimpanzee infant rarely vocalized spontaneously.


Copyright © 2003, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1243 印刷版ISSN 0001-8724 医学書院

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