The meg-bci system is very large and can take up half the room when assembled. It consists of several modules: an armchair, a huge magnetoencephalography scanner, as well as control equipment and operation panels, which are similar to ordinary Compared with other EEG equipment, its biggest difference is the bulky magnetoencephalography scanner - everyone is familiar with EEG. The flexible electrode grid can be worn on the head like a hairnet, but magnetoencephalography is a fixed device. A white cylinder that is motionless and more than one meter high. This behemoth hangs on the bracket behind the armchair. When using it, it needs to be placed upside down on the subject's head. It is like an oversized version of a hair iron, and the person has to sit down. Tuck your head in the chair.
There is only one meg-bci system in the Chengdu Institute. The day after Phytolacca got the approval, the Science City arranged for a Mi-171 helicopter to airlift it from Chengdu to 151, dismantled it into several large modules and lifted it off the plane. Then load it into a truck and transport it to the cave for reassembly.
The magnetoencephalogram scanner is a sophisticated and expensive thing. Its huge white cylinder is filled with hundreds of liters of -269c liquid helium. In this regard, it is similar to the MRI commonly used in hospitals, both of which require you to The scanning coil is placed in an extremely low temperature environment to achieve a superconducting state - so you must be careful when handling this thing, otherwise quenching will be troublesome.
Since the meg-bci system mainly monitors the magnetic field activity of the human brain, Shanglu asked Mr. Ji to borrow the only fully electromagnetic shielding room in 151. This room was originally owned by the Office of Planning and Engineering and was used to provide Shen Jiang with In daily training, the original equipment has been removed and replaced with meg-bci. 1047 was very dissatisfied with the operator's behavior of occupying the magpie's nest. He angrily went to Old Man Ji's office.
"Nonsense! Complete nonsense!" 1047 said, "How can they take up precious training time? What kind of non-invasive brain computer...isn't this fucking nonsense?"
"What's wrong?" Old Man Ji looked up lazily from behind his desk, "Is there a problem with your child?"
"The Operations Office has occupied a shielded room to develop non-invasive brain computers. Can they develop this thing?" 1047 said, "Can they develop something that even the Science City cannot develop? Isn't this a waste of time and money? Energy?"
"Do you have any objections?"
"Yes, I have a big opinion!"
Old Man Ji waved his hand, "Then report it to the Military Commission."
Shanglu led the operator's office to settle in the shielding room. This place also has a very deceiving name, called "Key Laboratory of Brain Cognition and Combat Training for Giant Weapon Drivers' BCI System".
Everyone from the work office followed anxiously. They had never done anything like this before. A group of people who were accustomed to being idle were suddenly dragged onto the battlefield by the director. It was really a rush to get on the battlefield, especially since there were a bunch of tricksters on the opposite side. The people from the work office stared at it, and the leader 1047 was obviously very annoyed.
The division of labor in Phytolacca is also very simple. He held the technical document in his hand and glanced around the office:
"Who knows Fourier transform?"
My cousin Li Wenxuan hesitated for a moment, raised his hand and said I can.
Phytolacca nodded and said it was very good, and his uncle was responsible for the filtering.
He continued to look at the technical documents and then asked: "Who has a foundation in psychology and neuromedicine?"
Bai Shu looked around, then whispered: "I learned a little bit in college..."
"Very good." Shang Lu nodded, "Bai Shu is in charge."
"S?" the girl asked, "Is it ature and sce? Do we still need to publish articles in this job?"
"It's the ervous system, the central nervous system." Phytolacca explained, "A core module of the meg-bci system, which mainly monitors brain activity - mechanical and microelectronic aspects... This job is for the uncle, and you are responsible for machine maintenance. "
Wang Xiangbing nodded.
"What about me?" Zhang Zhong asked, "Comrade Grandpa, what am I responsible for?"
Shang Lu looked up and down at the tendons all over his body and snapped his fingers: "You are the most important. You are responsible for carrying others back when they run away."
Engineers from 151 spent a whole day installing and debugging the meg-bci system. Phytolacca asked others to leave all their metal objects and electronic products outside before entering. Wang Xiangbing was a little embarrassed, saying that I How can you defeat someone with an iron will?
Li Wenxuan curiously touched here and there, especially the huge scanner. He asked, "What's in it?"
"Liquid helium." Phytolacca replied, "Have you ever seen magnetic resonance? Meg and trfmri are both means of obtaining brain activity information. Both methods have their own emphasis. Real-time functional magnetic resonance has an advantage in spatial resolution. Magnetoencephalography They have advantages in time resolution because they all capture magnetic signals, so they all require superconducting coils.”
Bai Shu sat curiously on the chair, carefully straightened his back, and stuffed his head into the scanner above his head. The contact surface between the scanner and the skull was a concave surface like an inverted bowl, reaching as deep as the bridge of Bai Shu's nose. The position is so good that even after the head is stuffed in, the eyes can’t be exposed.
"How fast is the information output of this system?" Bai Shu asked.
"It is only the most basic setting now, and the information output speed is about 60 bits per minute." Phytolacca replied.
"Can you try it now?" Baishu was very interested, "Let me guess what is thinking in my mind."
Phytophaga readily agreed.
There was a long initialization process after the meg-bci system was turned on. Phytolacca stood behind the operation panel on the opposite side of the room and asked: "Text message?"
The red lips under the scanner pursed and said: "Text message."
The rest of the people gathered behind Shang Lu. There was a blinking cursor on the blank monitor. The most basic brain-computer interface data output speed is only 60 bits/minute. Eight bits are a byte, and two bytes are a byte. Chinese characters, which means it can recognize up to three characters per minute.
"How do I imagine that word so that it can discern my thoughts?" Bai Shu asked.
"This system doesn't know you, so it doesn't have a deep learning algorithm for you. You can only use the most basic libraries." Phytolacca said, "You have to use general libraries."
"General library?"
"Everyone's brain activity is different. If you ask a hundred people to imagine a hen in their minds, each of them may imagine a different chicken. But fortunately, words are a certain system of symbols. , for Chinese characters, they have certain characteristics that allow everyone to have consistency when imagining them." Shanglu leaned his back against the wall, clasping his hands, "Regardless of men, women, old and young, they must follow the rules when imagining this character. Fixed rules and paths, exactly the same for everyone, guess what this feature is?”
Bai Shu thought for a while, she was very smart and reacted immediately:
"It's strokes."
"Yes, strokes are the most basic rules in this symbol system. They are consistent and universal, so you only need to imagine the process of writing this word in your mind, and the meg-bci system can recognize it." Shanglu said , "This is no different from other bci systems. They are all the most basic virtual sports imagination."
"good."
Bai Shu began to imagine the words he wanted to write in his mind.
The rest of the people gathered in front of the monitor, waiting for the word to pop up.
But this process was really slow. Wang Xiangbing and Li Wenxuan's eyes were sore because the word was still difficult to deliver.
"Can you really fight against the Angels on the battlefield at this speed?" Wang Xiangbing whispered, "The Angels leveled our nest before they even made a fart."
"Shut up and watch..." Li Wenxuan pinched his uncle's clothes, "Hey, hey, hey, he's out!"
The cursor on the screen flashed and the first word was typed:
"I".
"Si Guoyi!" Wang Xiangbing turned his head and gave a thumbs up to Phytolacca, "You can really identify them!"
Phytolacca chuckled.
Half a minute later the second word also came out:
"Give".
The crowd applauded.
"It's comparable to mind reading." Li Wenxuan said.
Phytolacca explained on the side: "It's not as magical as you think. It actually captures the signal of the oculomotor nerve. You can close your eyes and try it yourself. When you write stroke by stroke in your mind, your eyeballs Are you following along?"
Next comes the third word:
"Home".
"What is she writing?" Zhang Zhong asked, "Why can't it be strung together into one sentence?"
The fourth word is faster:
"land."
The last word:
"business".
