[[Research topics]]
*Statistical distribution of age of acquisition of words [#md36899c]

What determines vocabulary growth patterns? The research presented here examines the growth pattern of words listed in the McArthur-Bates Communicative Development Inventory using a computational model. Our model characterizes vocabulary growth curves based on the sampling of learning relevant events and a threshold (the number of such events needed) for acquisition of the word. Using this general class of models, fits of vocabulary growth curves suggests a transition from one in which acquisition is primarily limited by the threshold for acquisition to one in which acquisition is primarily limited by sampling speed. Further analyses suggest that these parameters of the learning model link to meaningful psychological factors: specifically the acquisition of threshold limited (and earlier learned) words are correlated with frequency whereas sampling-speed-limited words are correlated with imageability of the word in the input.

*語彙獲得曲線(獲得月齢分布)の統計的モデル [#f2383283]

#ref(VocabGrowth/visualization_model.png,50%)

図の説明: (a)事象X がある一定頻度で確率的に観察され(上段)、それが累積4 回に達した ときに単語を獲得する場合(中段、N=4)。獲得月齢はガンマ分布に従う(下段)。 (b)事象X の観測頻度が月齢を追って高くなり(上段, D>1)、一度の観察で単語が獲得される場合(中 段)。獲得月齢はワイブル分布に従う(下段)。

**関連する発表論文 [#fb3515a8]
**Related papers (See also [[other publications>Publications]]/ 関連する発表論文 ([[その他の論文など>Publications]]) [#l802220b]

-日高 昇平 (2009). 語彙獲得の月齢分布に基づく語彙学習機構の推定. 日本認知科学会第27回大会発表論文集.
[[(pdf):http://wwww.jaist.ac.jp/~shhidaka/JCSS2009_Vocabulary_growth.pdf]]
[[(pdf):http://www.jaist.ac.jp/~shhidaka/cv_publications/JCSS2009_Vocabulary_growth.pdf]]

-Hidaka, S. (2009). Different Classes of Words are Learned in Different Ways. In Proceedings of The Thirty First Annual Meeting of Cognitive Science Society, 2316-2321.
[[(pdf):http://wwww.jaist.ac.jp/~shhidaka/CogSci2009_Vocabulary_growth.pdf]]
[[(pdf):http://www.jaist.ac.jp/~shhidaka/cv_publications/CogSci2009_Vocabulary_growth.pdf]]


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