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The recently published "Nature and Science Report" magazine published an important advance in the study of brain-computer interface: US scientists replaced the electrode material in the implantable brain chip with glassy carbon, and succeeded in making the signal transmitted from the chip stronger. Clearer and longer service life.
The spinal cord is an important part of the central nervous system. Once injured, the patient loses the ability to activate the limbs, but the brain is still able to clearly transmit electrical pulse signals, and the limbs can also receive normal signals, but the signal is transmitted to the injured spinal cord and will be forced to stop. The scientists involved in the study came from the Center for Sensory and Neural Engineering (CSNE), a partnership between San Diego State University, Massachusetts Institute of Technology, and the University of Washington. They developed brain-computer interfaces that bypass the spinal cord and transmit the captured electrical signals. To limbs or even prostheses, to restore physical activity.
At present, the highest-end electrode material used for the brain-computer interface is thin-film platinum, which faces a major problem: it is easily corroded and causes the electrode to break. This new study uses glassy carbon that is 10 times smoother than the platinum film as the electrode material, which is more resistant to corrosion and can extend the service life.
The director of CSNE, Sam Kassigler, said that glass carbon has an advantage because it can directly recognize neurotransmitter signals. The signal-to-noise ratio of the signal thus obtained is doubled, making it clearer and easier to understand. Laboratory studies have initially shown that the improved new brain-computer interface can simultaneously capture neural signals in cerebral cortical nerve clusters and single neurons in deep brains, which will help scientists better understand the complex characteristics of brain signals.
A member of the Kassegler Group is conducting experiments with rats, hoping to apply precise electric pulses to stimulate the spinal cord to regenerate new nerve cells to replace damaged tissues, and a new brain-computer interface made of glassy carbon electrodes has greatly improved their Research capacity. (Reporter Nie Cuirong)
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