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Development of a serial order in speech constrained by articulatory coordination.

Oohashi H, Watanabe H, Taga G - PLoS ONE (2013)

Bottom Line: Furthermore, we reveal that serial order of different places of articulations within the same organ appears earlier and then gradually develops, whereas serial order of different articulatory organs appears later and then rapidly develops.In the same way, we also analyzed the sequences produced by English children and obtained similar developmental trends.These results suggest that the development of intra- and inter-articulator coordination constrains the acquisition of serial orders in speech with the complexity that characterizes adult language.

View Article: PubMed Central - PubMed

Affiliation: Graduate School of Education, The University of Tokyo, Tokyo, Japan ; Research Fellow of the Japan Society for the Promotion of Science, Koujimachi Business Center, Tokyo, Japan.

ABSTRACT
Universal linguistic constraints seem to govern the organization of sound sequences in words. However, our understanding of the origin and development of these constraints is incomplete. One possibility is that the development of neuromuscular control of articulators acts as a constraint for the emergence of sequences in words. Repetitions of the same consonant observed in early infancy and an increase in variation of consonantal sequences over months of age have been interpreted as a consequence of the development of neuromuscular control. Yet, it is not clear how sequential coordination of articulators such as lips, tongue apex and tongue dorsum constrains sequences of labial, coronal and dorsal consonants in words over the course of development. We examined longitudinal development of consonant-vowel-consonant(-vowel) sequences produced by Japanese children between 7 and 60 months of age. The sequences were classified according to places of articulation for corresponding consonants. The analyses of individual and group data show that infants prefer repetitive and fronting articulations, as shown in previous studies. Furthermore, we reveal that serial order of different places of articulations within the same organ appears earlier and then gradually develops, whereas serial order of different articulatory organs appears later and then rapidly develops. In the same way, we also analyzed the sequences produced by English children and obtained similar developmental trends. These results suggest that the development of intra- and inter-articulator coordination constrains the acquisition of serial orders in speech with the complexity that characterizes adult language.

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The developmental curve of each fronting pattern in Japanese.The black, gray and silver lines show developmental curves of the labial-vowel-coronal, labial-vowel-dorsal, and coronal-vowel-dorsal sequences, respectively. The circles, squares and triangles show raw fronting indices of the labial-vowel-coronal, labial-vowel-dorsal and coronal-vowel-dorsal sequences, respectively.
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pone-0078600-g004: The developmental curve of each fronting pattern in Japanese.The black, gray and silver lines show developmental curves of the labial-vowel-coronal, labial-vowel-dorsal, and coronal-vowel-dorsal sequences, respectively. The circles, squares and triangles show raw fronting indices of the labial-vowel-coronal, labial-vowel-dorsal and coronal-vowel-dorsal sequences, respectively.

Mentions: For the developmental changes in the preference for the direction of articulations, we obtained a developmental curve of the fronting index as shown in Figure 2ii (R2 = 0.200). As a result, we observed that preference to the fronting patterns exists 12 months and peaked around 18 months. This preference gradually decreased over time, and it disappeared after around 24 months. We confirmed that this asymmetry was observed in each of the labial-coronal, labial-dorsal and coronal-dorsal consonants patterns (Figure 4). Although the months at which the curves peaked were different among the three types of sequences, the increasing and decreasing patterns were common.


Development of a serial order in speech constrained by articulatory coordination.

Oohashi H, Watanabe H, Taga G - PLoS ONE (2013)

The developmental curve of each fronting pattern in Japanese.The black, gray and silver lines show developmental curves of the labial-vowel-coronal, labial-vowel-dorsal, and coronal-vowel-dorsal sequences, respectively. The circles, squares and triangles show raw fronting indices of the labial-vowel-coronal, labial-vowel-dorsal and coronal-vowel-dorsal sequences, respectively.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3818465&req=5

pone-0078600-g004: The developmental curve of each fronting pattern in Japanese.The black, gray and silver lines show developmental curves of the labial-vowel-coronal, labial-vowel-dorsal, and coronal-vowel-dorsal sequences, respectively. The circles, squares and triangles show raw fronting indices of the labial-vowel-coronal, labial-vowel-dorsal and coronal-vowel-dorsal sequences, respectively.
Mentions: For the developmental changes in the preference for the direction of articulations, we obtained a developmental curve of the fronting index as shown in Figure 2ii (R2 = 0.200). As a result, we observed that preference to the fronting patterns exists 12 months and peaked around 18 months. This preference gradually decreased over time, and it disappeared after around 24 months. We confirmed that this asymmetry was observed in each of the labial-coronal, labial-dorsal and coronal-dorsal consonants patterns (Figure 4). Although the months at which the curves peaked were different among the three types of sequences, the increasing and decreasing patterns were common.

Bottom Line: Furthermore, we reveal that serial order of different places of articulations within the same organ appears earlier and then gradually develops, whereas serial order of different articulatory organs appears later and then rapidly develops.In the same way, we also analyzed the sequences produced by English children and obtained similar developmental trends.These results suggest that the development of intra- and inter-articulator coordination constrains the acquisition of serial orders in speech with the complexity that characterizes adult language.

View Article: PubMed Central - PubMed

Affiliation: Graduate School of Education, The University of Tokyo, Tokyo, Japan ; Research Fellow of the Japan Society for the Promotion of Science, Koujimachi Business Center, Tokyo, Japan.

ABSTRACT
Universal linguistic constraints seem to govern the organization of sound sequences in words. However, our understanding of the origin and development of these constraints is incomplete. One possibility is that the development of neuromuscular control of articulators acts as a constraint for the emergence of sequences in words. Repetitions of the same consonant observed in early infancy and an increase in variation of consonantal sequences over months of age have been interpreted as a consequence of the development of neuromuscular control. Yet, it is not clear how sequential coordination of articulators such as lips, tongue apex and tongue dorsum constrains sequences of labial, coronal and dorsal consonants in words over the course of development. We examined longitudinal development of consonant-vowel-consonant(-vowel) sequences produced by Japanese children between 7 and 60 months of age. The sequences were classified according to places of articulation for corresponding consonants. The analyses of individual and group data show that infants prefer repetitive and fronting articulations, as shown in previous studies. Furthermore, we reveal that serial order of different places of articulations within the same organ appears earlier and then gradually develops, whereas serial order of different articulatory organs appears later and then rapidly develops. In the same way, we also analyzed the sequences produced by English children and obtained similar developmental trends. These results suggest that the development of intra- and inter-articulator coordination constrains the acquisition of serial orders in speech with the complexity that characterizes adult language.

Show MeSH
Related in: MedlinePlus