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Paper Abstract and Keywords
Presentation 2010-10-15 10:50
Size distortion of objects in apparent motion
Takahiro Kawabe (Kyushu Univ.) HIP2010-55
Abstract (in Japanese) (See Japanese page) 
(in English) This study investigated how prior and posterior motion direction affected the percept of an object’s size. Observers were exposed repetitions of a two-stroke apparent motion in which a vertical bar as an inducer was presented in the first frame for 100 ms and successively two vertical bars as test bars were presented in the second frame for 100 ms so as to invoke a split-fusion apparent motion. The observers were asked to judge which of test bars or comparison bars (i.e. without the first frame) were shorter. The length of comparison bars was controlled by following a randomly-interleaved staircase method. The results showed that points of subjective equality of test bars in the condition with the inducer shorter than test bars were significantly smaller than those in the condition with inducer as short as test bars. The size distortion was significantly reduced when luminance polarity of the inducer was reversed and when the inducer and test bars were simultaneously presented. Moreover, the size distortion was observed until the duration of the inducer and test bars exceeded 300 ms. These results suggest that posterior motion direction is predominantly employed to determine perceptual size of an object in apparent motion when prior and posterior motion signed opposite directions.
Keyword (in Japanese) (See Japanese page) 
(in English) Size perception / Apparent motion / Averaging / / / / /  
Reference Info. IEICE Tech. Rep., vol. 110, no. 228, HIP2010-55, pp. 69-72, Oct. 2010.
Paper # HIP2010-55 
Date of Issue 2010-10-07 (HIP) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
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)
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Conference Information
Committee HIP ITE-HI ITE-CE  
Conference Date 2010-10-14 - 2010-10-15 
Place (in Japanese) (See Japanese page) 
Place (in English) RIEC 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To HIP 
Conference Code 2010-10-HIP-HI-CE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Size distortion of objects in apparent motion 
Sub Title (in English)  
Keyword(1) Size perception  
Keyword(2) Apparent motion  
Keyword(3) Averaging  
1st Author's Name Takahiro Kawabe  
1st Author's Affiliation Kyushu University (Kyushu Univ.)
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Date Time 2010-10-15 10:50:00 
Presentation Time 25 
Registration for HIP 
Paper # IEICE-HIP2010-55 
Volume (vol) IEICE-110 
Number (no) no.228 
Page pp.69-72 
#Pages IEICE-4 
Date of Issue IEICE-HIP-2010-10-07 

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