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Paper Abstract and Keywords
Presentation 2026-07-02 15:25
A Computational Model of Anchoring and Adjustment Processes via Gibbs Sampling
Isao Ozawa, Airi Ono, Fumiya Komatsu, Tomoaki Hamada, Yoshihito Yasaki, Kazuki Takahashi, Takashi Takekawa (Kogakuin Univ.) NC2026-5 IBISML2026-5
Abstract (in Japanese) (See Japanese page) 
(in English) The anchoring effect can be interpreted as Bayesian updating by treating prior knowledge as a prior distribution and the anchor as uncertain data. Conversely, a widely recognized qualitative hypothesis known as "Anchoring and Adjustment" suggests that individuals initially accept the anchor and then sequentially adjust it based on their own knowledge. In this presentation, we establish a foundational model that derives the joint posterior distribution of the true value $mu$ and the anchor's reliability $gamma$, and propose a computational hypothesis assuming that $mu$ and $gamma$ are iteratively updated through Gibbs sampling. Under this hypothesis, the dynamic transition from the initial state, where $mu$ is strongly biased toward the anchor, to the convergence toward the posterior distribution through iteration, elegantly maps onto the adjustment process. Furthermore, by introducing a stopping rule based on convergence criteria, the model naturally accounts for the variability in response times observed in empirical data. In this study, we construct a hierarchical Bayesian model incorporating the proposed mechanism and estimate its parameters using MCMC to comprehensively reproduce the cognitive process from anchor presentation to response and response time.
Keyword (in Japanese) (See Japanese page) 
(in English) Anchoring and Adjustment / Gibbs Sampling / Dynamics / Response Time / Hierarchical Bayesian Model / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 90, NC2026-5, pp. 18-18, July 2026.
Paper # NC2026-5 
Date of Issue 2026-06-25 (NC, IBISML) 
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 NC2026-5 IBISML2026-5

Conference Information
Committee NC IBISML IPSJ-BIO IPSJ-MPS  
Conference Date 2026-07-01 - 2026-07-03 
Place (in Japanese) (See Japanese page) 
Place (in English) OIST 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To NC 
Conference Code 2026-07-NC-IBISML-BIO-MPS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Computational Model of Anchoring and Adjustment Processes via Gibbs Sampling 
Sub Title (in English)  
Keyword(1) Anchoring and Adjustment  
Keyword(2) Gibbs Sampling  
Keyword(3) Dynamics  
Keyword(4) Response Time  
Keyword(5) Hierarchical Bayesian Model  
Keyword(6)  
Keyword(7)  
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1st Author's Name Isao Ozawa  
1st Author's Affiliation Kogakuin University of Technology and Enginieering (Kogakuin Univ.)
2nd Author's Name Airi Ono  
2nd Author's Affiliation Kogakuin University of Technology and Enginieering (Kogakuin Univ.)
3rd Author's Name Fumiya Komatsu  
3rd Author's Affiliation Kogakuin University of Technology and Enginieering (Kogakuin Univ.)
4th Author's Name Tomoaki Hamada  
4th Author's Affiliation Kogakuin University of Technology and Enginieering (Kogakuin Univ.)
5th Author's Name Yoshihito Yasaki  
5th Author's Affiliation Kogakuin University of Technology and Enginieering (Kogakuin Univ.)
6th Author's Name Kazuki Takahashi  
6th Author's Affiliation Kogakuin University of Technology and Enginieering (Kogakuin Univ.)
7th Author's Name Takashi Takekawa  
7th Author's Affiliation Kogakuin University of Technology and Enginieering (Kogakuin Univ.)
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Speaker Author-7 
Date Time 2026-07-02 15:25:00 
Presentation Time 25 minutes 
Registration for NC 
Paper # NC2026-5, IBISML2026-5 
Volume (vol) vol.126 
Number (no) no.90(NC), no.91(IBISML) 
Page p.18 
#Pages 1 
Date of Issue 2026-06-25 (NC, IBISML) 

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