Flowing from Reasoning to Motion: Learning 3D Hand Trajectory Prediction from Egocentric Human Interaction Videos

Mingfei Chen; Yifan Wang; Zhengqin Li; Homanga Bharadhwaj; Yujin Chen; Chuan Qin; Ziyi Kou; Yuan Tian; Eric Whitmire; Rajinder Sodhi; Hrvoje Benko; Eli Shlizerman; Yue Liu

arXiv · 2512.16907

Flowing from Reasoning to Motion: Learning 3D Hand Trajectory Prediction from Egocentric Human Interaction Videos

Mingfei Chen·Yifan Wang·Zhengqin Li·Homanga Bharadhwaj·Yujin Chen·Chuan Qin·Ziyi Kou·Yuan Tian·Eric Whitmire·Rajinder Sodhi·Hrvoje Benko·Eli Shlizerman·Yue Liu

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Abstract

Prior works on 3D hand trajectory prediction are constrained by datasets that decouple motion from semantic supervision and by models that weakly link reasoning and action. To address these, we first present the EgoMAN dataset, a large-scale egocentric dataset for interaction stage-aware 3D hand trajectory prediction with 219K 6DoF trajectories and 3M structured QA pairs for semantic, spatial, and motion reasoning. We then introduce the EgoMAN model, a reasoning-to-motion framework that links vision-language reasoning and motion generation via a trajectory-token interface. Trained progressively to align reasoning with motion dynamics, our approach yields accurate and stage-aware trajectories with generalization across real-world scenes.

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Mingfei Chen, Yifan Wang, Zhengqin Li, Homanga Bharadhwaj, Yujin Chen, Chuan Qin, Ziyi Kou, Yuan Tian, Eric Whitmire, Rajinder Sodhi, Hrvoje Benko, Eli Shlizerman, Yue Liu. 2025-12-18. Flowing from Reasoning to Motion: Learning 3D Hand Trajectory Prediction from Egocentric Human Interaction Videos. https://arxiv.org/abs/2512.16907

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