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Hands link2/16/2024 "When we use our hands to grasp an object, for example a ball, we move our fingers in a synchronized way and adapt to the shape of the object when contact occurs," says Prof. That means that the brain activates a pool of muscle cells, also in the forearm. These patterns can be interpreted as the way in which the human brain copes with the complexity of the biological system. What is the synergy principle? "It is known from neuroscientific studies that repetitive patterns are observed in experimental sessions, both in kinematics and muscle activation," says Prof. The synergy principle: The brain activates a pool of muscle cells The work is published in the 2023 International Conference on Rehabilitation Robotics (ICORR). Piazza's research team has shown that artificial intelligence can enable patients to control advanced hand prostheses more intuitively by using the "synergy principle" and with the help of 128 sensors on the forearm. "These are movements that the patient has to learn during rehabilitation," says Cristina Piazza, a professor of rehabilitation and assistive robotics at TUM. The same approach makes it possible to control different finger movements that are selected with the simultaneous activation of both flexor and extensor muscle groups. If the wrist extensor muscles are contracted, the fingers re-open and the hand releases the pen. These movements can be selected via a smartphone app or by using muscle signals from the forearm, typically detected by two sensors.įor instance, the activation of wrist flexor muscles can be used to close the fingers together to grip a pen. ![]() Some of these modern prostheses allow independent finger movements and wrist rotation. They can enable amputees who have lost a hand through accident or illness to regain some movement. Technological developments in recent decades have already led to advanced artificial hands.
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