Kouki Miyazawa

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Infants learn language at an incredible speed, and one of the first steps in this voyage is learning the basic sound units of their native languages. It is widely thought that caregivers facilitate this task by hyperarticulating when speaking to their infants. Using state-of-the-art speech technology, we addressed this key theoretical question: Are sound(More)
In Japanese, vowel duration can distinguish the meaning of words. In order for infants to learn this phonemic contrast using simple distributional analyses, there should be reliable differences in the duration of short and long vowels, and the frequency distribution of vowels must make these differences salient enough in the input. In this study, we(More)
All normal humans can acquire their native phoneme systems simply by living in their native language environment. However, it is unclear as to how infants learn the acoustic expression of each phoneme of their native languages. In recent studies, researchers have inspected phoneme acquisition by using a computational model. However, these studies have used(More)
In this study, we propose a method to assign a personality to a spoken dialogue agent and evaluate effectiveness of the method. Recently, some research studies on human-agent interaction (HAI) showed that it is possible to assign a personality by controlling non-verbal information of an agent. However, we consider that verbal information sent from an agent(More)
The characteristics of the spoken language used to address infants have been eagerly studied as a part of the language acquisition research. Because of the uncontrollability factor with regard to the infants, the features and roles of infant- directed speech were tried to be revealed by the comparison of speech directed toward infants and that toward other(More)
Infant-directed speech (IDS) is known to differ from adult-directed speech (ADS) in a number of ways, and it has often been argued that some of these IDS properties facilitate infants' acquisition of language. An influential study in support of this view is Kuhl et al. (1997), which found that vowels in IDS are produced with expanded first and second(More)
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