CausalCEM: Self-improved causal counterfactual emotion modeling for multimodal physiological signals. - Kexin Zhu; Jian Shen 004; Suran Xu; Bingkun Ren; Xiaolin Tan; Zhuohan Sun; Chenxu Guo; Haoran Gao; Yanan Zhang; Bin Hu 001 (Inf. Fusion, 2026)