Table 13.

Ablation Experiment Results (mean ± SD over ten random seeds; paired t-tests against the complete model with Bonferroni correction for six comparisons)

Configuration	Accuracy (%)	F1 Score	AUC	Δ (pp)	t(9)	p (Bonferroni)	Cohen’s d
Complete Model	91.3 ± 0.4	0.908 ± 0.005	0.952 ± 0.003	—	—	—	—
w/o Cross-modal Attention	83.5 ± 0.7	0.826 ± 0.009	0.891 ± 0.006	−7.8	23.4	< 1 × 10⁻⁸	6.2
w/o Spatiotemporal Alignment	85.7 ± 0.5	0.847 ± 0.007	0.908 ± 0.005	−5.6	16.8	2.1 × 10⁻⁷	4.8
w/o Gated Fusion	87.2 ± 0.5	0.864 ± 0.006	0.921 ± 0.004	−4.1	12.5	3.2 × 10⁻⁶	3.7
w/o Data Augmentation	88.1 ± 0.5	0.873 ± 0.006	0.928 ± 0.004	−3.2	9.6	2.9 × 10⁻⁵	2.9
IMU Only	82.7 ± 0.6	0.814 ± 0.008	0.879 ± 0.006	−8.6	25.7	< 1 × 10⁻⁸	6.8
Scale Only	79.4 ± 0.8	0.782 ± 0.010	0.856 ± 0.007	−11.9	30.2	< 1 × 10⁻⁹	7.5