Mental World Modeling

World models enable a predictive substrate for planning and action, yet existing formulations merely answer a physical question: what/where it is, and how will it evolve. Human behavior, however, is driven by hidden mental state (what a person believes, wants, intends, feels, and considers socially permissible), so a model that tracks the physical scene but not what each agent knows and believes about it predicts the wrong action for the right-looking scene. We formulate Mental World Modeling (M

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ethics.ai (28 July 2026), “Mental World Modeling,” evidence record 15866, https://ethics.ai/record/15866 (originally published by HuggingFace Daily Papers).

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