Grammaticalization is an important factor in language evolution as it may contribute to the emergence and the evolution of grammatical forms (Heine &Kuteva, 2002; Hurford, 2003). Considering what kinds of dispositions in cogni-tive mechanism can induce grammaticalization is significant in studying the originof language. Hashimoto and Nakatsuka (2006) showed that two designs of mean-ing structure, "pragmatic extension" and "cooccurrence", were effective to real-ize unidirectional meaning changes, the centric feature of grammaticalization, by constructing a computational model of grammaticalization. This model is madebased on the iterated learning model of Kirby (2002), in which a speaker having a set of production rules utters descriptions of some situations composed of someelemental meanings to a hearer who tries to construct his/her own rule set. Inthis paper, we analyze the relationships of the two designs with metaphoric and metonymic inferencing, the important mechanisms for meaning change.
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