Defend Namsan Park

Chapter 43 MEG-BCI
The MEG-BCI system is very bulky, and it can take up half the area of ​​a room when assembled. It consists of several modules: an armchair, a huge magnetoencephalogram scanner, and control equipment and operation panels, which are different from ordinary Compared with the current EEG equipment, its biggest difference is the bulky magnetoencephalogram scanner-everyone is familiar with the electroencephalogram, the flexible electrode grid can be worn on the head like a hairnet, but the magnetoencephalogram is a fixed An immobile white cylinder more than one meter high, this behemoth is hung on the bracket behind the armchair. When in use, it needs to be buckled upside down on the subject's head, like a super-large version of a hair iron. People have to sit Tuck your head in on the chair.

There is only such a set of MEG-BCI system in Chengzi Institute. On the second day after Shanglu got the approval, Science City arranged for a Mi-171 helicopter to airlift it from Chengdu to 151, disassemble it into several large modules and lift it off the plane. Then load it into the cave and reassemble it.

The magnetoencephalography scanner is a precise and expensive thing. Its huge white cylinder is filled with hundreds of liters of liquid helium at -269°C. In this regard, it is similar to the MRI commonly used in hospitals. The scanning coils of my own are placed in an extremely low temperature environment to achieve a superconducting state-so you must be careful when tossing this thing, and quenching will be troublesome.

Since the MEG-BCI system mainly monitors the magnetic field activity of the human brain, Shang Lu asked the old man Ji to borrow the only fully electromagnetic shielded room in 151 miles. Daily training, now the original equipment has been dismantled and replaced with MEG-BCI, 1047 was very dissatisfied with the behavior of the dove occupying the magpie's nest, and he went to Old Man Ji's office angrily.

"Nonsense! Total nonsense!" 1047 said. "How can they take up precious training time? What kind of non-invasive brain machine...isn't this fucking nonsense?"

"What's the matter?" Old man Ji raised his eyes lazily behind the desk, "Is there a problem?"

"The Operations Office has occupied the shielding room, and they are developing non-invasive brain computers. Can this be produced?" 1047 said, "How can they produce something that the Science City can't produce? This is not a waste of time and effort." Do you have energy?"

"Do you have an opinion?"

"Yes, I have a big opinion!"

Old Man Ji waved his hand, "Then you report it to the Military Commission."

Shang Lu led the Operations Office into the shielding room. This place also has a very bluffing name called "Key Laboratory of BCI System Brain Cognition and Combat Training for Giant Machinery Pilots".

Everyone from the Operations Office followed in anxiously. They had never done anything like this before. A group of people who were used to Xianyu were suddenly dragged into the battlefield by the director. The people from the Work Office stared at it, and the leader of 1047 was obviously very annoyed.

The division of labor in Phytophthora is also very simple. Holding the technical document in his hand, he glanced around the office:
"Who knows Fourier transform?"

Uncle Li Wenxuan hesitated for a moment, then raised his hand and said I would.

Shanglu nodded and said it was very good, Uncle Biao was in charge of filtering.

He continued to look at the technical documents, and then asked: "Who has a background in psychology and neuromedicine?"

Bai Shu looked around, then whispered: "I learned a little in college..."

"Very good." Shang Lu nodded her, "Bai Shu is in charge of CNS."

"C...CNS?" the girl asked, "Cell, Nature and Science? Are we going to publish articles for this job?"

"It's the Central nervous system." Phytolaca explained, "A core module of the MEG-BCI system, which mainly monitors brain activity—mechanical and microelectronic aspects... This job is for uncle, uncle, 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 him up and down, and snapped his fingers: "You are the most important thing. You are responsible for carrying others back when they are running."

The engineers of 151 spent a whole day installing and debugging the MEG-BCI system. Shanglu asked other people to leave all the metal objects and electronic products on their bodies outside before entering the door. Wang Xiangbing was a little embarrassed and said that I How can you take down a body of iron and steel will?

Li Wenxuan touched here and there curiously, especially the huge scanner. He asked, "What's in it?"

"Liquid helium." Phytophthora replied, "Have you ever seen MRI? Both MEG and trfMRI are means of obtaining brain activity information. The two methods have their own emphasis. Real-time functional MRI has an advantage in spatial resolution. Magnetoencephalography There are advantages in time resolution, all by capturing magnetic signals, so superconducting coils are required."

Bai Shu sat curiously on the chair, straightened his back carefully, and stuffed his head into the scanner above his head. The contact surface between the scanner and the head was an inverted bowl-like concave surface, reaching as deep as the bridge of Bai Shu's nose. , The eyes are not exposed after the head is stuffed in.

"How fast is the information output speed of this system?" Bai Shu asked.

"It's just the most basic setting now, and the information output speed is about 60 bits per minute." Phytolaca replied.

"Can I try it now?" Bai Shu was very interested, "Let it guess what's going on in my mind."

Shang Lu readily agreed.

After the MEG-BCI system was turned on, there was a long initialization process. Phytorea stood behind the operation panel on the opposite side of the room and asked, "Text information?"

The red lips under the scanner pursed and said, "Text information."

The rest of the people gathered behind Shanglu. There was a blinking cursor on the blank monitor. The data output speed of the most basic brain-computer interface is only 60 bits per minute. Eight bits are one byte, and two bytes are one byte. Chinese characters, that is to say, it can recognize up to three characters per minute.

"How do I imagine that word so that it can distinguish 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 library." Phytophthora said, "You have to use a general library."

"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 set of definite symbol systems. , for Chinese characters, they have certain characteristics that allow everyone to imagine them with consistency." Phytophthora leans against the wall, clasping his hands, "Whether men, women, or children, they must follow the rules when imagining this character. Fixed rules and paths, everyone is exactly the same, guess what is this feature?"

Bai Shu thought for a while, she was very smart, and immediately reacted:

"It's strokes."

"That's right, the stroke is the most basic rule in this symbol system. It has consistency and versatility, so you only need to imagine the process of writing the character in your mind, and the MEG-BCI system can recognize it." Phytophthora said , "This is no different from other BCI systems, it is the most basic virtual motor imagination."

"it is 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, Li Wenxuan, and Zhang Chong's eyes were sore, and the word was still difficult to deliver.

"With this speed, is it really possible to go to the battlefield against Angel?" Wang Xiangbing muttered in a low voice, "Angel has flattened our nest and it hasn't farted yet."

"Shut up, take a good look..." Li Wenxuan pinched his uncle's clothes, "Hey, hey, it's out!"

The cursor on the screen flickered, and the first word was typed:

"I".

"Si Guoyi!" Wang Xiangbing turned his head and gave Shanglu a thumbs up, "I can really recognize it!"

Shang Lu chuckled.

Half a minute later, the second word also came out:

"Give".

The crowd applauded.

"It's comparable to mind reading." Li Wenxuan said.

Phytophthora explained on the side: "It's not as magical as you think. It actually captures the signal of the oculomotor nerve. You can try it yourself with your eyes closed. When you write strokes in your mind, your eyeballs Are you following along?"

Next comes the third word:

"Family".

"What is she writing?" Zhang Zhong asked, "Why can't it be strung together into one sentence?"

The fourth word is faster:
"land."

last word:

"business".

(End of this chapter)