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Paper Abstract and Keywords
Presentation 2011-03-07 10:15
A theoretical study of orientation map alteration induced by single-orientation exposure in the developing brain
Nodoka Wakabayashi, Masanobu Miyashita (Numazu Nat. Col. Tech.), Shigeru Tanaka (Univ. of Electro-Communications) NC2010-127
Abstract (in Japanese) (See Japanese page) 
(in English) Using intrinsic signal optical imaging, it has been confirmed that in the visual cortex of kittens that experienced a single orientation through cylindrical-lens goggles, cortical domains selectively responsive to the experienced orientation expanded with a sensitive period. To elucidate how the onset time of single-orientation experience affects the orientation map alteration, we carried out computer simulations based on our model for the self-organization of geniculocortical inputs. First, we conducted simulation assuming only spontaneous activities in the LGN, which represents a developmental condition before eye opening. Next, using the map established before eye opening as an initial map, we performed simulations by presenting 12 oriented gratings to the model retina, which represents a normal visual condition after eye opening. The arrangement of preferred orientations was found to become more regular and orientation selectivity was enhanced as the simulation step. Finally, simulations assuming a single orientation exposure for a fixed period immediately after the normal visual experience showed that the expansion of cortical domains for the experienced orientation decreased with the simulation step of the normal visual experience. Taken together, it was demonstrated that our model can well reproduce the qualitative features of orientation maps in goggle-reared kittens.
Keyword (in Japanese) (See Japanese page) 
(in English) Primary visual cortex / orientation selectivity / self-organization / / / / /  
Reference Info. IEICE Tech. Rep., vol. 110, no. 461, NC2010-127, pp. 1-6, March 2011.
Paper # NC2010-127 
Date of Issue 2011-02-28 (NC) 
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 NC MBE  
Conference Date 2011-03-07 - 2011-03-09 
Place (in Japanese) (See Japanese page) 
Place (in English) Tamagawa University 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To NC 
Conference Code 2011-03-NC-MBE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A theoretical study of orientation map alteration induced by single-orientation exposure in the developing brain 
Sub Title (in English)  
Keyword(1) Primary visual cortex  
Keyword(2) orientation selectivity  
Keyword(3) self-organization  
1st Author's Name Nodoka Wakabayashi  
1st Author's Affiliation Numazu National College of Technology (Numazu Nat. Col. Tech.)
2nd Author's Name Masanobu Miyashita  
2nd Author's Affiliation Numazu National College of Technology (Numazu Nat. Col. Tech.)
3rd Author's Name Shigeru Tanaka  
3rd Author's Affiliation The University of Electro-Communications (Univ. of Electro-Communications)
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Speaker Author-1 
Date Time 2011-03-07 10:15:00 
Presentation Time 25 minutes 
Registration for NC 
Paper # NC2010-127 
Volume (vol) vol.110 
Number (no) no.461 
Page pp.1-6 
Date of Issue 2011-02-28 (NC) 

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