Table 3.

Key open questions for DoF augmentation.

Can DoF augmentation enhance functional abilities in real-life scenarios? Would such augmentation be deemed useful and acceptable by human users?

Is DoF augmentation by extension possible? If possible, which bodily signals can support it, and how many additional DoF is the nervous system able to control?

How does feedback for DoF augmentation alter the user’s performance and SE embodiment? How is that feedback best conveyed?

How can the brain represent supernumerary limbs? Which brain reorganization is induced by use of DoF augmentation devices? And which plasticity and computational mechanism underlie the acquisition and control of DoF augmentation?