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Adaptive Behavior
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How Phonological Structures Can Be Culturally Selected for Learnability

Pierre-Yves Oudeyer

Sony CSL Paris, France

This paper shows how phonological structures can be culturally selected so as to become learnable and adapted to the ecological niche formed by the brains and bodies of speakers. A computational model of the cultural formation of syllable systems illustrates how general learning and physical biases can influence the evolution of the structure of vocalization systems. We use the artificial life methodology of building a society of artificial agents, equipped with motor, perceptual and cognitive systems that are generic and have a realistic complexity. We demonstrate that agents, playing the "imitation game," build shared syllable systems and show how these syllable systems relate to existing human syllable systems. Detailed experiments study the learnability of the self-organized syllable systems. In particular, we reproduce the critical period effect and the artificial language learning effect without the need for innate biases which specify explicitly in advance the form of possible phonological structures. The ability of children agents to learn syllable systems is explained by the cultural evolutionary history of these syllable systems, which were selected for learnability.

Key Words: origins of speech • evolution • acquisition • constraint • phonetics • phonology • learnability

Adaptive Behavior, Vol. 13, No. 4, 269-280 (2005)
DOI: 10.1177/105971230501300407
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B. de Boer
Evolution of Speech and Its Acquisition
Adaptive Behavior, December 1, 2005; 13(4): 281 - 292.
[Abstract] [PDF]