Beyond Motion Primitives: Behavioral Activity Recognition from Head-Mounted IMU. - Chung-Ta Huang; Léopold Das; Jeffrey Zhou; Faizaan Siddique; Julia Seungjoo Baek; Serena Liu; Andrew Rusli; Todd Y. Zhou; Freddy Yu; Sinclair Hansen; Ziling Hu; Arnav Sharma; et al. (CoRR, 2026)