Before revision:  Our approach is compared with the current standard approach of repetitively applying non-negative matrix factorisation (NMF) to a series of the movements. Results: The results show that the constrained Tucker method successfully identified the shared and task-specific synergies for all 3 DoF tensorsdirectly and it was robust to misassignments with regard to task-repetition information unlike NMF, thanks to exploring the multi-way structure of muscle activity.
After revision:  Our approach is compared with the current standard approach of repetitively applying non-negative matrix factorisation (NMF) to a series of movements. The results show that the constrained Tucker method successfully identified the shared and task-specific synergies for all 3 DoF tensorsdirectly and it was robust to misassignments with regard to task-repetition information unlike NMF, thanks to exploring the multi-way structure of muscle activity.