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Paper Abstract and Keywords
Presentation 2026-03-02 10:20
Arrangement of Electrodes for a Wearable EEG Device on Hair-Covered Areas
Sachi Tamechika, Hitoshi Yamaguchi, Yutaka Kamamoto (NTT) HCS2025-82
Abstract (in Japanese) (See Japanese page) 
(in English) Daily-use EEG devices require miniaturization and ease of wear, but miniaturization limits the scalp–electrode contact area while accurate signal acquisition remains necessary.
Over hair-covered areas, pin electrodes are often used to reduce hair-related interference; however, partial loss of scalp contact and contact changes due to motion or slippage can increase noise and degrade signal quality.
In this study, we examined a signal-quality improvement method using our previously proposed hair-clip-type EEG device. With contact impedance matched, electrodes with different pin counts were compared, showing that poorly contacting pins increase noise in the 50 Hz band. We then evaluated a multi-electrode design that divides a dense pin array into multiple groups and found that selecting well-contacting electrodes reduces noise and improves signal-to-noise ratio and temporal stability. Overall, subdividing the contact area enables robust electrode selection and, with optional signal processing, improves signal quality in hair-clip-type EEG devices.
Keyword (in Japanese) (See Japanese page) 
(in English) Vital signs sensing device / EEG / / / / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 368, HCS2025-82, pp. 54-59, March 2026.
Paper # HCS2025-82 
Date of Issue 2026-02-22 (HCS) 
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 HCS2025-82

Conference Information
Committee HCS  
Conference Date 2026-03-01 - 2026-03-02 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To HCS 
Conference Code 2026-03-HCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Arrangement of Electrodes for a Wearable EEG Device on Hair-Covered Areas 
Sub Title (in English)  
Keyword(1) Vital signs sensing device  
Keyword(2) EEG  
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1st Author's Name Sachi Tamechika  
1st Author's Affiliation NTT, Inc (NTT)
2nd Author's Name Hitoshi Yamaguchi  
2nd Author's Affiliation NTT, Inc (NTT)
3rd Author's Name Yutaka Kamamoto  
3rd Author's Affiliation NTT, Inc (NTT)
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Speaker Author-1 
Date Time 2026-03-02 10:20:00 
Presentation Time 20 minutes 
Registration for HCS 
Paper # HCS2025-82 
Volume (vol) vol.125 
Number (no) no.368 
Page pp.54-59 
#Pages 6 
Date of Issue 2026-02-22 (HCS) 

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