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Paper Abstract and Keywords
Presentation 2010-11-19 09:50
NIRS-measurement of brain activity in the correction of the eye
Masako Sugai, Masaharu Adachi (Tokyo Denki Univ.) NC2010-64
Abstract (in Japanese) (See Japanese page) 
(in English) NIRS (Near infrared spectroscopy) is a spectroscopic method to assess dynamic changes in the hemoglobin concentration evoked by brain activity. In this study, we investigate the relationship between the brain activity in occipital area associated with presenting visual stimuli and the power of the lenses.
Two healthy volunteers with mild myopia (about -4D) participated in the experiment. Landolt’s ring was used to check the visual acuity examination. In every session, task was performed with concave lenses and rest without them. We examined on convex lens of different power (-1D,-3D) and different stimulus size. The percentage of stimulus answered correctly (PSAC) were assigned to three categories (chance level, partial, visible).
Characteristic changes were found in both subjects. Some of the channels in or next to visual cortex, oxygenated hemoglobin concentration changes increased significantly. We investigated the beta values, which were positive in almost all the channels when PSAC improved. In case that PSAC was chance level without lens and no longer changed better with it, beta value tends to be negative in parietal area. When PSAC is visible with lens as good as without lens, beta values are negative in almost all of the channels.
Suitable correction of the eye brings quality of vision. On the other hand, lack of correction or overcorrection of glasses sometimes causes asthenopia, headache, waning productivity and so on. These results could contribute to qualify and quantify of the correction of the eye.
Keyword (in Japanese) (See Japanese page) 
(in English) Near infra-red spectroscopy (NIRS) / General linear model (GLM) / Visual stimuli / / / / /  
Reference Info. IEICE Tech. Rep., vol. 110, no. 295, NC2010-64, pp. 65-70, Nov. 2010.
Paper # NC2010-64 
Date of Issue 2010-11-11 (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 NC2010-64

Conference Information
Committee MBE NC  
Conference Date 2010-11-18 - 2010-11-19 
Place (in Japanese) (See Japanese page) 
Place (in English) Tohoku University 
Topics (in Japanese) (See Japanese page) 
Topics (in English) BCI/BMI, NC and MBE 
Paper Information
Registration To NC 
Conference Code 2010-11-MBE-NC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) NIRS-measurement of brain activity in the correction of the eye 
Sub Title (in English) * 
Keyword(1) Near infra-red spectroscopy (NIRS)  
Keyword(2) General linear model (GLM)  
Keyword(3) Visual stimuli  
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1st Author's Name Masako Sugai  
1st Author's Affiliation Tokyo Denki University (Tokyo Denki Univ.)
2nd Author's Name Masaharu Adachi  
2nd Author's Affiliation Tokyo Denki University (Tokyo Denki Univ.)
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Speaker Author-1 
Date Time 2010-11-19 09:50:00 
Presentation Time 25 minutes 
Registration for NC 
Paper # NC2010-64 
Volume (vol) vol.110 
Number (no) no.295 
Page pp.65-70 
#Pages 6 
Date of Issue 2010-11-11 (NC) 

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