Let the prosthesis feel pain

  Maybe someone is very strong and not afraid of pain, and if someone says that they like pain, do you believe it? Some people are pursuing pain today.
  Pain is a protective
  effect, pain is the body’s very practical a protective mechanism, it is the body of a reminder suffered injuries, with a strong feeling of “remind” the body immediately from harm.
  If a person does not feel pain is very bad, he will be vulnerable to fatal injuries. In the world, a small number of people are born without pain. They live in difficult times, and life is on the verge of death. For example, a painless infant will accidentally bite the meat while sucking his fingers, but he will continue to chew it; the child without pain may be curious and put his hand into the boiling water, but he will not feel burned (deadly ) Pain, and maybe continue to play. In fact, these painless children rarely grow up and basically die.
  In addition, some people will lose their pain when they are “acquired” because of accidents. They are some disabled people, especially those who have broken limbs and continue to have prostheses. During the use of the prosthesis, occasional collisions and scrapes will inevitably damage the prosthesis. At present, the technology cannot recover the nerves of the prosthetic limbs, which means that the user cannot be detected for the first time when the prosthesis is damaged. It can be discovered later with the eyes, or it can be discovered if the damage is serious and cannot be used normally. This has certain safety hazards.
  Pain prosthetic
  end, the US scientists are trying to develop artificial limb pain comes, it has created is very important. Feeling pain can make the prosthesis more real, more like a part of the body, not a tool attached to the body.
  This technique is called “electronic dermis”, which is the electronic skin on the fingers of prosthetic limbs. It has a sense of pressure that is felt by a thin layer of rubber and textile. It also senses the difference between round, sharp, sharp objects, converting a “tactile” signal into a series of electrical pulses.
  The earliest attempted painful prosthesis was a 29-year-old volunteer who cut his arms a few years ago due to a blood infection. The researchers first tested his broken arm and applied electrical pulses to different parts. He found that some parts made him “feel” like the touch of the thumb, while others were like the index finger. If you change the type of electric pulse, the sense of lightness and touch will also change, including slight touch, moderate squeeze, and so on.
  Using these tactile sensations, combined with pain indices (1 to 10 in total, 1 = comfort, 10 = fatal pain), the researchers limited the tactile pain index to less than 3. With these feelings, the volunteer used a prosthetic touch to distinguish between round and sharp objects and pick them up.
  This made him realize that he has a real hand again after many years! Also by the feeling of pain, he can instinctively judge whether the arm is in danger, which is more conducive to avoid accidental damage of the prosthesis.
  In the end, scientists hope that prosthetics can have a certain “self-awareness.” When a finger catches a too sharp object, it can be loosened immediately, without the need to control it through the brain; when it catches something too slippery, it can release more force and hold it tighter, just like human instinct The same is true for conditioned reflections. In addition, the user can “force” it to do things and control its instinctive reaction, just as in special cases, people put their hands into the fire to take things. This is the complete “hand” in the true sense.