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Paper Abstract and Keywords
Presentation 2026-06-11 09:55
Association Between Chaos in Heart Rate Variability and Cognitive Activity
Tomoyuki Mao, Hidetoshi Okutomi (Toshiba Information Systems), Ken Umeno (Kyoto Univ.) NLP2026-2 CCS2026-2
Abstract (in Japanese) (See Japanese page) 
(in English) Heartbeat intervals are not constant but exhibit temporal fluctuations. These fluctuations arise from the regulatory action of the autonomic nervous system. Conversely, by analyzing these fluctuations, it is possible to assess the state of autonomic nervous activity. This analytical approach is known as heart rate variability analysis and has traditionally been based mainly on statistical analysis and frequency analyses. Because heartbeat fluctuations are considered to originate from nonlinear and complex physiological systems, the application of nonlinear analysis, including analyses of chaos and complexity, has recently attracted increasing interest. However, no established consensus has yet been reached regarding the physiological and functional significance of nonlinear analysis. In our experiments, indices related to chaos and complexity in heart rate variability increased markedly under cognitive task, such as arithmetic tasks. In contrast, conventional indices based on statistical and frequency analyses showed little or no significant change. These results indicate that heart rate variability is influenced not only by autonomic nervous activity but also by higher-order brain activity, including activity in the prefrontal cortex. In this paper, we present an overview of our experiments and discuss the interaction between the heart and the brain.
Keyword (in Japanese) (See Japanese page) 
(in English) Chaos degree / RR-interval / Herat rate variability / Higher-order brain activity / Large-scale brain network / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 69, CCS2026-2, pp. 5-10, June 2026.
Paper # CCS2026-2 
Date of Issue 2026-06-04 (NLP, CCS) 
ISSN 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 NLP2026-2 CCS2026-2

Conference Information
Committee CCS NLP  
Conference Date 2026-06-11 - 2026-06-12 
Place (in Japanese) (See Japanese page) 
Place (in English) I-site Namba 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Nonlinear Problems, Complex Communication Sciences, etc. 
Paper Information
Registration To CCS 
Conference Code 2026-06-CCS-NLP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Association Between Chaos in Heart Rate Variability and Cognitive Activity 
Sub Title (in English)  
Keyword(1) Chaos degree  
Keyword(2) RR-interval  
Keyword(3) Herat rate variability  
Keyword(4) Higher-order brain activity  
Keyword(5) Large-scale brain network  
Keyword(6)  
Keyword(7)  
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1st Author's Name Tomoyuki Mao  
1st Author's Affiliation Toshiba Information Systems (Japan) Corporation (Toshiba Information Systems)
2nd Author's Name Hidetoshi Okutomi  
2nd Author's Affiliation Toshiba Information Systems (Japan) Corporation (Toshiba Information Systems)
3rd Author's Name Ken Umeno  
3rd Author's Affiliation Kyoto University (Kyoto Univ.)
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Speaker Author-1 
Date Time 2026-06-11 09:55:00 
Presentation Time 25 minutes 
Registration for CCS 
Paper # NLP2026-2, CCS2026-2 
Volume (vol) vol.126 
Number (no) no.68(NLP), no.69(CCS) 
Page pp.5-10 
#Pages 6 
Date of Issue 2026-06-04 (NLP, CCS) 

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