The researchers explained that when people pick up an object, their vision is the first to work. Then in
Users of manipulators have tovisually determine when they grab onto an object just by looking at it. However, this requires a lot of training and full attention. Adding other senses would have obvious benefits.
Scientists' first attempts to create feedbackand pressure during touch involves the transfer of sensations to the area of the skin. The system required extensive training to translate all user sensations into information about the pressure exerted by the manipulator fingers. However, the researchers then got an idea of the areas of the brain that process information sent to them by the sensory nerve cells of the hand. For the new study, the team implanted two electrode arrays in the part of the brain that processes information from the skin. The activation of the electrodes caused the sensation of something interacting with the palm and fingers.
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A study participant paralyzed below the neckfor about two years, he controlled a robotic arm using brain implants in the area of motor control of the brain. He could use his hand even if he didn’t have any sensations. However, in new experiments, the research team alternated tests in which the hand had additional tactile feedback and tests in which this system was disabled. Most of the tests involved grabbing objects of various shapes, moving them somewhere, and then dropping them.
In many individual tests, similarpicture: the presence of a sense of touch sharply increased the efficiency of work. The average take-move-drop sequence execution time decreased in all cases, and in about half of them the difference was statistically significant. During the time it took the participant to complete nine tasks with the sensor system turned off, he was able to complete more than a dozen tasks with the active system.
Although every aspect of completing the assignment wasimproved, the most significant growth occurred during the capture of the object. The time between when the participant touched the object with his hand and lifted it off the table was reduced by two-thirds when sensory feedback was turned on. When the system was turned off, the competitor spent more time positioning the arm to provide a stable grip before moving on.
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