Release date: 2016-10-17
Tactile perception is an important function of the hand, but the prosthetic limb controlled by the human brain has not been able to obtain this important feeling. Thanks to the microelectrodes implanted in the brain, people who use prosthetics for the first time simulate the receptors through the pressure of finger breaks, with limited tactile sensations. This advancement greatly enhances the possibility of restoring limited sensing capabilities in various parts of the body, while also allowing the user to better control the prosthetic, but recovering some special sensations, such as pain and warmth, requires more challenges.
The study found that stimulating the cerebral cortex, where the somatosensory center is located, with microelectrode stimulation from within the cortex can produce a tactile-like sensation in the neural prosthesis. The study was published in the October 13th issue of Science Translational Medicine.
Nathan Copeland has been unable to move the ends of his legs and hands since a car accident at the age of 18 that damaged his spine. After 12 years, he could feel his robotic arm touching the object.
"He said that this feeling is like a real hand, the leader who can clearly feel every finger," said Professor Robert Gaunt from the University of Pittsburgh.
"Sometimes it's an electrical signal, sometimes a stress signal, but most of the time I can accurately perceive each of my fingers," Nathan Copeland said.
Scientists say the findings are a key step forward and have important implications for restoring the perception of the crowd.
However, this technique also has limitations. Although Copeland can feel the basic pressure sensing, he still can't get the feeling of movement, temperature and pain, and can't sense the fingertips and thumb. Implanting more chips may improve this situation. But like mobile, the corresponding area in the brain is smaller than the pressure.
These challenges may be solved by better implant electrodes or deeper implant locations. At the same time, researchers are also trying to establish a wireless connection at the implanted electrode and the tip of the robotic arm, because now each additional chip requires an additional line connection, increasing the risk of infection.
But some scientists are skeptical that the robotic arm can fully simulate the real arm, because the performance of this complex mechanical device comes from the complex signal transmission, and the development of this technology will be affected by the consideration of lifting control. limit.
This article was originally compiled by Bio 360, welcome to reprint
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