Dynamic Personality in LLM Agents: A Framework for Evolutionary Modeling and Behavioral Analysis in the Prisoner’s Dilemma

Using Large Language Model agents to simulate human game behaviors offers valuable insights for human social psychology in anthropomorphic AI research.While current models rely on static personality traits, real-world evidence shows personality evolves through environmental feedback.Recent work introduced dynamic personality traits but lacked natural selection processes and direct psychological metrics, failing to accurately capture authentic dynamic personality variations.To address these limitations, we propose an enhanced framework within the Prisoner's Dilemma, a socially significant scenario.By using game payoffs as environmental feedback, we drive adaptive personality evolution and analyze correlations between personality metrics and behavior.Our framework reveals new behavioral patterns of agents and evaluates personality-behavior relationships, advancing agent-based social simulations and human-AI symbiosis research.