A New Multi-Domain Benchmark for Micro-Action Recognition and Detection

Yanbin Hao; Pengyu Liu; Xing Wei; Xun Yang; Dan Guo; Meng Wang

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arXiv · 2606.14096

A New Multi-Domain Benchmark for Micro-Action Recognition and Detection

Yanbin Hao·Pengyu Liu·Xing Wei·Xun Yang·Dan Guo·Meng Wang

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Abstract

Micro-actions are short-duration, low-amplitude subtle body movements at the whole-body level that can reveal latent intentions, involuntary reactions, and fine-grained affective changes. Our previous MA-52 benchmark has provided an important foundation for micro-action recognition, but it remains limited in scale, scene diversity, task coverage, and evaluation protocols. To advance micro-action analysis toward more realistic and comprehensive settings, we introduce MMA-82, a large-scale multi-domain extension of MA-52. MMA-82 expands the label space from 52 to 82 fine-grained micro-action categories and covers four distinct domains, including laboratory interviews, street interviews, psychiatric patient interviews, and emotion-rich television videos, resulting in 77,856 annotated instances from 454 subjects. Built upon MMA-82, we establish two core tasks: Micro-Action Recognition and Multi-label Micro-Action Detection. For recognition, we further define in-domain and cross-domain protocols, including few-shot and zero-shot settings, to evaluate model robustness, transferability, and generalization. Extensive experiments show that current methods still struggle with realistic micro-action understanding, especially under domain shift, long-tailed category distributions, and complex temporal localization. Beyond benchmarking, we investigate the relationship between micro-actions and emotion, showing that micro-actions are strongly associated with emotional states and provide complementary cues to facial micro-expressions for improved emotion recognition. These results demonstrate that MMA-82 serves as a comprehensive and challenging benchmark for realistic micro-action analysis and a valuable resource for human-centered AI. MMA-82 is available at https://lpynow.github.io/MMA-82-AIM/.

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BibTeX RIS

Yanbin Hao, Pengyu Liu, Xing Wei, Xun Yang, Dan Guo, Meng Wang. 2026-06-16. A New Multi-Domain Benchmark for Micro-Action Recognition and Detection. https://arxiv.org/abs/2606.14096

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