IntentQA: Intent Question Answering in Videos by Cognitive Context Reasoning
Jiapeng Li Ping Wei^✉ Wenjuan Han Song-Chun Zhu Lifeng Fan^✉
IEEE Transactions on Pattern Analysis and Machine Intelligence, 2026.
Paper ICCV version Supp Dataset Demo

PureSpace: A Benchmark for Abstract Spatial Reasoning in Vision-Language Models
Jinkai Li Zhenliang Zhang Lifeng Fan^✉ Wei Wang^✉
CVPR Findings, 2026.
Paper (coming)

Read the Room: Video Social Reasoning with Mental-Physical Causal Chains
Lixing Niu Jiapeng Li Xingping Yu Xinyi Dong Shu Wang Ruining Feng Bo Wu Ping Wei Yisen Wang Lifeng Fan^✉
International Conference on Learning Representations (ICLR), 2026.
Paper Arxiv Version

Learning Concept-Based Causal Transition and Symbolic Reasoning for Visual Planning
Yilue Qian Peiyu Yu Yingnian Wu Yao Su Wei Wang^✉ Lifeng Fan^✉
IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS), 2024
Arxiv Paper

Evaluating and Modeling Social Intelligence: A Comparative Study of Human and AI Capabilities
Junqi Wang* Chunhui Zhang* Jiapeng Li Yuxi Ma Lixing Niu Jiaheng Han Yujia Peng^✉ Yixin Zhu^✉ Lifeng Fan^✉
Proceedings of the Annual Meeting of the Cognitive Science Society (CogSci), 2024
Paper Demo Code & Dataset Appendix

Smart Help: Strategic Opponent Modeling for Proactive and Adaptive Robot Assistance in Households
Zhihao Cao* Zidong Wang* Siwen Xie Anji Liu Lifeng Fan^✉
IEEE Conference on Computer Vision and Pattern Recognition (CVPR), 2024.
Paper Code Data & Model Demo Poster

Artificial Social Intelligence: A Comparative and Holistic View
Lifeng Fan Manjie Xu Zhihao Cao Yixin Zhu^✉ Song-Chun Zhu^✉
CAAI Artificial Intelligence Research, 2022.
Paper
中国科学报/科学网1 中国科学报/科学网2 北大新闻网 北大AI院官网 北大科研官微 北大新工科官微 北大AI院官微

Learning Triadic Belief Dynamics in Nonverbal Communication from Videos
Lifeng Fan* Shuwen Qiu* Zilong Zheng Tao Gao Song-Chun Zhu Yixin Zhu^✉
IEEE Conference on Computer Vision and Pattern Recognition (CVPR), 2021.
Paper Supp Code Dataset Demo Oral
MIT科技评论 DeepTech

Understanding Human Gaze Communication by Spatio-Temporal Graph Reasoning
Lifeng Fan* Wenguan Wang* Siyuan Huang Xinyu Tang Song-Chun Zhu^✉
The IEEE International Conference on Computer Vision (ICCV), 2019.
Paper Code Dataset Demo

Inferring Shared Attention in Social Scene Videos
Lifeng Fan* Yixin Chen* Ping Wei^✉ Wenguan Wang Song-Chun Zhu
IEEE Conference on Computer Vision and Pattern Recognition (CVPR), 2018.
Paper Code Dataset Demo