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Paper Abstract and Keywords
Presentation 2010-08-10 10:15
Influence of number of subjects on percentage of correct answers in a psychoacoustical experiment of sound image localization
Akihiro Kudo (Tomakomai Nat Coll. of Tech.) EA2010-51
Abstract (in Japanese) (See Japanese page) 
(in English) Decision of Required Number of Subjects (RNS) to obtain the stable and reliable results in the psychoacoustical experiment to evaluate the sound image localization accuracy, is one of the important issues in the
psychoacoustics. This paper presents new method to decide the RNS by employing the statistical confidence interval computed from the percentage of correct answers obtained from the results that subject responds the relative localization of evaluation stimulus to reference stimulus in the horizontal direction. ITD was used as a parameter
to arrange the presented azimuth of the sound image. The curves to indicate a relation between the number of subjects and the averages of the percentage of correct answers, were considered. There are two types of the curves. One of the curves(decremental curve) is obtained from the data of the percentage of correct answers of all subjects that were sorted in ascending order. Remainder(incremental curve) is obtained from the data that were sorted in descending order. A confidence interval analysis with a confidence level of 95% showed that , for the decremental
curve, 1) the characteristic curve of RNS { averages of the percentage of correct answers is a quadric function with negative gradient, 2) RNS of 32 is needed under the experiment condition with the averages of the percentage of correct answers from 0.50 to 1.00, for the incremental series, 3) RNS slightly depends on the averages of the percentage of correct answers, 4) RNS of 32 is needed under the experiment condition with the averages of the percentage of correct answers from 0.50 to 0.90. From these results, our conclusion is that RNS of 35 is required for
psychoacoustical experiment of the sound image localization.
Keyword (in Japanese) (See Japanese page) 
(in English) psychoacoustics / sound image localization experiment / number of subjects / / / / /  
Reference Info. IEICE Tech. Rep., vol. 110, no. 171, EA2010-51, pp. 47-52, Aug. 2010.
Paper # EA2010-51 
Date of Issue 2010-08-02 (EA) 
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)
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Conference Information
Committee EA  
Conference Date 2010-08-09 - 2010-08-10 
Place (in Japanese) (See Japanese page) 
Place (in English) Tohoku Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Acoustic Signal Processing, Psychological and Physiological Acoustics, and Related Topics 
Paper Information
Registration To EA 
Conference Code 2010-08-EA 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Influence of number of subjects on percentage of correct answers in a psychoacoustical experiment of sound image localization 
Sub Title (in English)  
Keyword(1) psychoacoustics  
Keyword(2) sound image localization experiment  
Keyword(3) number of subjects  
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1st Author's Name Akihiro Kudo  
1st Author's Affiliation Tomakomai National College of Technology (Tomakomai Nat Coll. of Tech.)
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Speaker Author-1 
Date Time 2010-08-10 10:15:00 
Presentation Time 30 minutes 
Registration for EA 
Paper # EA2010-51 
Volume (vol) vol.110 
Number (no) no.171 
Page pp.47-52 
#Pages 6 
Date of Issue 2010-08-02 (EA) 

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