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Paper Abstract and Keywords
Presentation 2012-03-08 14:00
Estimating the vocabulary spurt onset using two piece linear regression
Yasuhiro Minami, Tessei Kobayashi, Hiroaki Sugiyama (NTT) SP2011-159
Abstract (in Japanese) (See Japanese page) 
(in English) Vocabulary spurt is the term used to describe the rapid increase in word-learning speed at around 18 months of age. However, it still remains controversial whether this increase is a discrete or a continuous change. To define the onset of a vocabulary spurt, the present study analyzed longitudinal data from vocabulary histories of Japanese-speaking children by a two piece linear regression, which models the target using combination of two lines. We asked 17 monolingual Japanese-speaking mothers to report the acquisition date, pronunciation, and meaning of newly learned words that their children produced from 10 to 24 months via a web diary that we constructed for this project. The statistically determined two piece linear regression fitted very well with the individual data of cumulative vocabulary as a function of age. The result shows that the vocabulary spurt occurs at 614 days of age and at the 40.5th word on the average. Moreover, the estimations showed that children learned words at rates of average 5.4 words and 25.0 words per month before and after the vocabulary spurt, respectively and the latter rate is constant. The present study analyzed onsets of vocabulary spurts phenomenologically, assuming that vocabulary spurts should be discrete phenomena. However, we found a possibility to introduce a new model for the vocabulary spurts. We also discuss this point of view.
Keyword (in Japanese) (See Japanese page) 
(in English) Vocabulary spurt / infants / two piece linear regression / / / / /  
Reference Info. IEICE Tech. Rep., vol. 111, no. 471, SP2011-159, pp. 25-30, March 2012.
Paper # SP2011-159 
Date of Issue 2012-03-01 (SP) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Notes on Review This article is a technical report without peer review, and its polished version will be published elsewhere.
Download PDF SP2011-159

Conference Information
Committee SP  
Conference Date 2012-03-08 - 2012-03-09 
Place (in Japanese) (See Japanese page) 
Place (in English) Riken Brain Science Institute 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To SP 
Conference Code 2012-03-SP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Estimating the vocabulary spurt onset using two piece linear regression 
Sub Title (in English)  
Keyword(1) Vocabulary spurt  
Keyword(2) infants  
Keyword(3) two piece linear regression  
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1st Author's Name Yasuhiro Minami  
1st Author's Affiliation NTT Corporation (NTT)
2nd Author's Name Tessei Kobayashi  
2nd Author's Affiliation NTT Corporation (NTT)
3rd Author's Name Hiroaki Sugiyama  
3rd Author's Affiliation NTT Corporation (NTT)
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Speaker Author-1 
Date Time 2012-03-08 14:00:00 
Presentation Time 30 minutes 
Registration for SP 
Paper # SP2011-159 
Volume (vol) vol.111 
Number (no) no.471 
Page pp.25-30 
#Pages 6 
Date of Issue 2012-03-01 (SP) 

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