Effects of Theory of Mind and Prosocial Beliefs on Steering Human-Aligned Behaviors of LLMs in Ultimatum Games

• URL: http://arxiv.org/abs/2505.24255v1
• Date: Fri, 30 May 2025 06:23:52 GMT
• Title: Effects of Theory of Mind and Prosocial Beliefs on Steering Human-Aligned Behaviors of LLMs in Ultimatum Games
• Authors: Neemesh Yadav, Palakorn Achananuparp, Jing Jiang, Ee-Peng Lim,
• Abstract summary: We investigate the role of theory-of-mind (ToM) reasoning in aligning agentic behaviors with human norms in negotiation tasks.<n>ToM reasoning enhances behavior alignment, decision-making consistency, and negotiation outcomes.<n>Our findings contribute to the understanding of ToM's role in enhancing human-AI interaction and cooperative decision-making.
• Score: 17.615991993062455
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Large Language Models (LLMs) have shown potential in simulating human behaviors and performing theory-of-mind (ToM) reasoning, a crucial skill for complex social interactions. In this study, we investigate the role of ToM reasoning in aligning agentic behaviors with human norms in negotiation tasks, using the ultimatum game as a controlled environment. We initialized LLM agents with different prosocial beliefs (including Greedy, Fair, and Selfless) and reasoning methods like chain-of-thought (CoT) and varying ToM levels, and examined their decision-making processes across diverse LLMs, including reasoning models like o3-mini and DeepSeek-R1 Distilled Qwen 32B. Results from 2,700 simulations indicated that ToM reasoning enhances behavior alignment, decision-making consistency, and negotiation outcomes. Consistent with previous findings, reasoning models exhibit limited capability compared to models with ToM reasoning, different roles of the game benefits with different orders of ToM reasoning. Our findings contribute to the understanding of ToM's role in enhancing human-AI interaction and cooperative decision-making. The code used for our experiments can be found at https://github.com/Stealth-py/UltimatumToM.

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