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Paper Abstract and Keywords
Presentation 2026-05-23 10:15
Individual Differences in Implicit Learning Measured by Reaction Time Variability
Sota Hayashi, Junya Hara, Yuichi Tanaka, Hiroshi Higashi (UOsaka) HCS2026-22 HIP2026-22
Abstract (in Japanese) (See Japanese page) 
(in English) Human beings are capable of acquiring regularities embedded in the environment naturally, even without conscious awareness; this ability is referred to as implicit learning.
Although marked individual differences have been observed in the process of implicit learning, the factors underlying these differences remain insufficiently understood.
In this study, we hypothesized that individual differences in concentration (attentional state) influence the progression of learning, and investigated the relationship between implicit learning and reaction time variability, an index reflecting concentration.
In a behavioral experiment involving human participants ($N = 54$), we used random dot kinematogram stimuli in which white and black dot clouds moved in different directions.
Participants were asked to choose either the white or black dots, report the direction of motion of the chosen dot cloud, and received rewards according to the selected dot color and the angular error in their motion report.
An implicit reward structure was assigned to the choice of dot color, such that participants could maximize their reward by learning this hidden structure.
The analysis revealed that, among participants with greater reaction time variability, the proportion of choosing the high-reward dot cloud increased significantly as the task progressed.
Reaction time variability is thought to reflect transitions between attentive and inattentive states.
Therefore, these findings suggest that dynamic changes in attentional state may be a factor that governs the progression of implicit learning.
Keyword (in Japanese) (See Japanese page) 
(in English) Implicit Learning / Attentional State / Reaction Time / Coefficient of Variation / Reward Structure / Random Dot Kinematogram / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 39, HIP2026-22, pp. 113-118, May 2026.
Paper # HIP2026-22 
Date of Issue 2026-05-15 (HCS, HIP) 
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 HCS2026-22 HIP2026-22

Conference Information
Committee HIP HCS HI-SIGCOASTER  
Conference Date 2026-05-22 - 2026-05-23 
Place (in Japanese) (See Japanese page) 
Place (in English) Okinawa Industry Support Center 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Communication Enhancing, Human Communications, and Human Information Processing 
Paper Information
Registration To HIP 
Conference Code 2026-05-HIP-HCS-SIGCOASTER 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Individual Differences in Implicit Learning Measured by Reaction Time Variability 
Sub Title (in English)  
Keyword(1) Implicit Learning  
Keyword(2) Attentional State  
Keyword(3) Reaction Time  
Keyword(4) Coefficient of Variation  
Keyword(5) Reward Structure  
Keyword(6) Random Dot Kinematogram  
Keyword(7)  
Keyword(8)  
1st Author's Name Sota Hayashi  
1st Author's Affiliation The University of Osaka (UOsaka)
2nd Author's Name Junya Hara  
2nd Author's Affiliation The University of Osaka (UOsaka)
3rd Author's Name Yuichi Tanaka  
3rd Author's Affiliation The University of Osaka (UOsaka)
4th Author's Name Hiroshi Higashi  
4th Author's Affiliation The University of Osaka (UOsaka)
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Speaker Author-1 
Date Time 2026-05-23 10:15:00 
Presentation Time 20 minutes 
Registration for HIP 
Paper # HCS2026-22, HIP2026-22 
Volume (vol) vol.126 
Number (no) no.38(HCS), no.39(HIP) 
Page pp.113-118 
#Pages 6 
Date of Issue 2026-05-15 (HCS, HIP) 

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