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Paper Abstract and Keywords
Presentation 2012-12-17 13:00
Transition from desynchronous to synchronous neural dynamics in cortical network model of spontaneous firing activity
Hisashi Kada (Rits), Takahiro Iwamoto (JAIST), Jun-nosuke Teramae (RIKEN), Isao Tokuda (Rits) NLP2012-88
Abstract (in Japanese) (See Japanese page) 
(in English) Spontaneous brain activity represents internal dynamics of a cortical neural network. Without sensory stimulation, cortical neurons give rise to highly irregular, asynchronous, and low-frequency firing activities. Despite many theoretical models proposed to elucidate the spontaneous activity, the most essential question of how the cortical noise is generated from the internal brain dynamics remained open. Recently, Teramae et al. (2012) proposed a neuronal network model with a log-normal distribution of the excitatory postsynaptic potential (EPSP) and successfully clarified that the existence of a few but significantly strong EPSPs is the key factor for sustaining the irregular low-firing cortical activity. Up to now, the log-normal network model focused mainly on the first order statistics of the network connectivity. This paper introduces bidirectional couplings with correlated EPSPs to the log-normal network model. We show that the correlation gives rise to a group of neurons with significantly high firing frequency, which initiate synchronous firing activity of the cortical neurons. We utilized cross-correlogram (CCG) to characterize the synchronized firing activities. The neurons with high firing frequency are shown to be identified by the eigen-analysis of the connection matrix of the EPSP.
Keyword (in Japanese) (See Japanese page) 
(in English) spontaneous firing activity / matrix of the EPSP / cross-correlogram / high firing frequency / / / /  
Reference Info. IEICE Tech. Rep., vol. 112, no. 363, NLP2012-88, pp. 1-6, Dec. 2012.
Paper # NLP2012-88 
Date of Issue 2012-12-10 (NLP) 
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 NLP  
Conference Date 2012-12-17 - 2012-12-18 
Place (in Japanese) (See Japanese page) 
Place (in English) Fukui City Communication Plaza 
Topics (in Japanese) (See Japanese page) 
Topics (in English) General 
Paper Information
Registration To NLP 
Conference Code 2012-12-NLP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Transition from desynchronous to synchronous neural dynamics in cortical network model of spontaneous firing activity 
Sub Title (in English)  
Keyword(1) spontaneous firing activity  
Keyword(2) matrix of the EPSP  
Keyword(3) cross-correlogram  
Keyword(4) high firing frequency  
1st Author's Name Hisashi Kada  
1st Author's Affiliation Ritsumeikan University (Rits)
2nd Author's Name Takahiro Iwamoto  
2nd Author's Affiliation Japan Advanced Institute of Science and Technology (JAIST)
3rd Author's Name Jun-nosuke Teramae  
3rd Author's Affiliation RIKEN (RIKEN)
4th Author's Name Isao Tokuda  
4th Author's Affiliation Ritsumeikan University (Rits)
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Date Time 2012-12-17 13:00:00 
Presentation Time 25 
Registration for NLP 
Paper # IEICE-NLP2012-88 
Volume (vol) IEICE-112 
Number (no) no.363 
Page pp.1-6 
#Pages IEICE-6 
Date of Issue IEICE-NLP-2012-12-10 

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