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Paper Abstract and Keywords
Presentation 2009-03-12 10:00
Phase transition in population codes
Yusuke Usui (Tokyo Univ.), Masafumi Oizumi (Tokyo Univ./DC1), Masato Okada (Tokyo Univ./RIKEN Brain Sci Inst.) NC2008-126
Abstract (in Japanese) (See Japanese page) 
(in English) We studied the influence of phase transition in neural activities on population coding.
We addressed this issue in an Ising-Spin model with Mexican-hat type interactions.
In this model, network activities have three stable states, i.e., paramagnetic state, ferromagnetic state, and localized state.
Which state network activities converge to depends on the strength of lateral connections and the intrinsic properties of a model neuron.
The performance of population coding is measured by Fisher information, which is the estimation error for optimal readout. We found that the properties of population coding drastically changed near the phase transition points. The amount of information extracted by linear readout was dominant in paramagnetic phase and ferromagnetic phase, whereas the amount of information extracted by nonlinear readout becomes prominent in localized phase. This means that when neural activities are in localized state, it is necessary to use a nonlinear readout scheme to capture an adequate amount of information.
Keyword (in Japanese) (See Japanese page) 
(in English) Population codes / Phase transition / Fisher information / Mexican-hat connectivity / Population vector / / /  
Reference Info. IEICE Tech. Rep., vol. 108, no. 480, NC2008-126, pp. 135-140, March 2009.
Paper # NC2008-126 
Date of Issue 2009-03-04 (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 2009-03-11 - 2009-03-13 
Place (in Japanese) (See Japanese page) 
Place (in English) Tamagawa Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To NC 
Conference Code 2009-03-NC-MBE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Phase transition in population codes 
Sub Title (in English)  
Keyword(1) Population codes  
Keyword(2) Phase transition  
Keyword(3) Fisher information  
Keyword(4) Mexican-hat connectivity  
Keyword(5) Population vector  
1st Author's Name Yusuke Usui  
1st Author's Affiliation Tokyo University (Tokyo Univ.)
2nd Author's Name Masafumi Oizumi  
2nd Author's Affiliation Tokyo University/Research Fellow of the Japan Society for the Promotion of Science (Tokyo Univ./DC1)
3rd Author's Name Masato Okada  
3rd Author's Affiliation Tokyo University/RIKEN Brain Science Institute (Tokyo Univ./RIKEN Brain Sci Inst.)
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Speaker Author-1 
Date Time 2009-03-12 10:00:00 
Presentation Time 25 minutes 
Registration for NC 
Paper # NC2008-126 
Volume (vol) vol.108 
Number (no) no.480 
Page pp.135-140 
Date of Issue 2009-03-04 (NC) 

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