Grip force regulates hand impedance to optimize object stability in high impact loads

▶ Hand-held objects interact with the environment through impacts. ▶Motor prediction is critical as time available for sensory feedback is too short. ▶In collisions, grip force peaked ∼65 ms after the impact. ▶This maximum is pre-programmed and robust across target stiffness. ▶The CNS optimizes stability by regulating hand impedance through grip force.