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Paper Abstract and Keywords
Presentation 2011-07-26 09:55
Detection of alpha phase modulation caused by visual input
Yasushi Naruse (NICT), Ken Takiyama (Tokyo Univ.), Masato Okada (Tokyo Univ./RIKEN), Hiroaki Umehara (NICT) NC2011-33
Abstract (in Japanese) (See Japanese page) 
(in English) Ongoing oscillations in electroencephalogram (EEG) and magnetoencephalogram (MEG) have recently gained attention, since they are synchronized among cortical areas. This phenomenon is caused by phase modulations of the ongoing oscillations. In order to detect phase modulations, we averaged many trials since the signal to noise ratio of EEG and MEG was low. Thus, we have detected only the phase modulations that are synchronized between trials. However, all of the phase modulations are not synchronized between trials, and therefore, we have missed many of the modulations that are not synchronized between trials. In this study, we developed a novel method for detecting phase modulations of the ongoing oscillations in a single trial. We modeled the phase and amplitude of an ongoing oscillation as Markov random field models based on our previous study. Our method used the line process to detect modulations of the phase and amplitude of an ongoing oscillation. By using our method, we detected phase modulations of the alpha rhythm in flash EEG data after the flash stimulus onset. This result suggests that our method is useful to detect phase modulations of ongoing oscillations.
Keyword (in Japanese) (See Japanese page) 
(in English) Markov random field model / Line process / Electroencephalography / Alpha rhythm / Phase modulation / / /  
Reference Info. IEICE Tech. Rep., vol. 111, no. 157, NC2011-33, pp. 71-74, July 2011.
Paper # NC2011-33 
Date of Issue 2011-07-18 (NC) 
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)
Download PDF NC2011-33

Conference Information
Committee NC  
Conference Date 2011-07-25 - 2011-07-26 
Place (in Japanese) (See Japanese page) 
Place (in English) Graduate School of Engineering, Kobe University 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Intelligent systems and general 
Paper Information
Registration To NC 
Conference Code 2011-07-NC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Detection of alpha phase modulation caused by visual input 
Sub Title (in English)  
Keyword(1) Markov random field model  
Keyword(2) Line process  
Keyword(3) Electroencephalography  
Keyword(4) Alpha rhythm  
Keyword(5) Phase modulation  
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Keyword(8)  
1st Author's Name Yasushi Naruse  
1st Author's Affiliation National Institute of Information and Communications Technology (NICT)
2nd Author's Name Ken Takiyama  
2nd Author's Affiliation The University of Tokyo (Tokyo Univ.)
3rd Author's Name Masato Okada  
3rd Author's Affiliation The University of Tokyo/ RIKEN (Tokyo Univ./RIKEN)
4th Author's Name Hiroaki Umehara  
4th Author's Affiliation National Institute of Information and Communications Technology (NICT)
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Speaker Author-1 
Date Time 2011-07-26 09:55:00 
Presentation Time 25 minutes 
Registration for NC 
Paper # NC2011-33 
Volume (vol) vol.111 
Number (no) no.157 
Page pp.71-74 
#Pages 4 
Date of Issue 2011-07-18 (NC) 

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