Offline cross-validated DOF-based prediction accuracy. (A,C) Overall DOF-prediction accuracy when all DOF complexities of prompt data (including 1-, 2-, and 3-DOF prompts) are predicted. Using all-motion training (A) results in greater proportion of correct DOF activity than motion-specific training (C) (p < 0.001). (B,D) DOF-prediction accuracy by separated by the DOF complexity of the prompt to be predicted. Using motion-specific training (D) resulted in more additional activation of unintended movements than using all-motion training (B) (p < 0.001), primarily in 1-DOF prompts.