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Paper Abstract and Keywords
Presentation 2026-03-02 13:00
Does Others' Altruistic Behavior Promote Reciprocal Decision-Making? -- An Ultimatum Game Study with an Artificial Agent --
Kishin Oasa, Shigen Shimojo, Yugo Hayashi (Ritsumeikan Univ.) HCS2025-86
Abstract (in Japanese) (See Japanese page) 
(in English) This study investigates the formation of reciprocal altruism in human--agent interaction using the Ultimatum Game, focusing on the process by which individuals infer the generative principles of others' actions. We manipulated two factors in the agent's strategy: the presence of a selfish, egocentric strategy which adhered rigidly to its own policy, and an altruistic, exocentric strategy which adapted to human feedback. The results showed that participants rejected proposals less frequently when the agent adopted the altruistic strategy or did not adopt the selfish strategy. Furthermore, the exocentric strategy increased the perception of safety toward the agent, whereas the presence of the egocentic strategy lowered perception of intelligence. These findings suggest that individual decision-making in negotiation is shaped not only by distributional outcomes but also by inferences regarding others' internal policy, particularly their responsiveness to social signals.
Keyword (in Japanese) (See Japanese page) 
(in English) HAI / agent / ultimatum game / reciprocal altruism / other-model formation / intention inference / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 368, HCS2025-86, pp. 78-84, March 2026.
Paper # HCS2025-86 
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 HCS2025-86

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) Does Others' Altruistic Behavior Promote Reciprocal Decision-Making? 
Sub Title (in English) An Ultimatum Game Study with an Artificial Agent 
Keyword(1) HAI  
Keyword(2) agent  
Keyword(3) ultimatum game  
Keyword(4) reciprocal altruism  
Keyword(5) other-model formation  
Keyword(6) intention inference  
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Keyword(8)  
1st Author's Name Kishin Oasa  
1st Author's Affiliation Ritsumeikan University (Ritsumeikan Univ.)
2nd Author's Name Shigen Shimojo  
2nd Author's Affiliation Ritsumeikan University (Ritsumeikan Univ.)
3rd Author's Name Yugo Hayashi  
3rd Author's Affiliation Ritsumeikan University (Ritsumeikan Univ.)
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Speaker Author-1 
Date Time 2026-03-02 13:00:00 
Presentation Time 20 minutes 
Registration for HCS 
Paper # HCS2025-86 
Volume (vol) vol.125 
Number (no) no.368 
Page pp.78-84 
#Pages 7 
Date of Issue 2026-02-22 (HCS) 

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