The MEG-BCI system is very large and can take up half a room when assembled, it consists of several modules: an armrest recliner, a huge magnetoencephalography scanner, and control equipment and operation panel, compared with ordinary EEG equipment, its biggest difference is the bulky magnetoencephalography scanner - EEG is familiar to everyone, the flexible electrode grid can be worn on the head like a hairnet, but the magnetoencephalography is a fixed, white cylinder more than a meter high, The behemoth hangs from a stand on the back of an armchair and is used upside down on the subject's head, like an oversized version of a headiron, which one has to sit on and stuff into.

The day after Shanglu received the approval, Science City arranged for a Mi-171 helicopter to be airlifted from Chengdu to 151, disassembled into several large modules and carried off the plane, and then loaded into a warehouse and reassembled.

The magnetoencephalography scanner is a delicate and expensive thing, and its large white cylinder is filled with hundreds of liters of -269C liquid helium, and in this respect it is similar to the common MRI in hospitals, which requires its own scanning coil to be placed in an extremely low temperature environment to achieve superconductivity - so you have to be careful with this thing, quench will be troublesome.

Since the MEG-BCI system mainly monitors the magnetic field activity of the human brain, Shang Lu asked Old Man Ji to borrow the only all-electromagnetic shielded room in 151, this room was originally owned by the Planning and Engineering Office, used to do daily training for Shen Jiang, and 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 angrily found Old Man Ji's office.

"Nonsense! Utter nonsense! 1047 said, "How can they take up valuable training time?" What kind of non-invasive brain-computer ...... Isn't that nonsense? ”

"What's wrong?" Old man Ji raised his eyes lazily behind the desk, "Have a problem?" ”

"The operation office has occupied the shielded room, and engaged in non-invasive brain computers, can this thing be made?" 1047 said, "What can't be made in Science City, can they make it?" Isn't this a waste of time and energy? ”

"Do you have an opinion?"

"Yes, I have a big opinion!"

Old man Ji waved his hand, "Then you can report to the Military Commission." ”

Shang Lu led the operation office to settle in the shielding room, and this place also has a very bluffing name, called "Key Laboratory of Brain Cognition and Combat Training of BCI System for Giant Machinery Drivers".

The people from the work office followed in with anxiety, they had never done this thing, and a group of people who were used to idle fish were suddenly pulled onto the battlefield by the director, and it was really to catch ducks on the shelves, especially on the opposite side, there was a large group of people from the work office staring, and the 1047 headed by him was obviously very annoyed.

The division of labor in Shanglu is also very simple, he holds the technical document in his hand, and raises his eyes in the office to sweep around:

"Who understands the Fourier transformation?"

Cousin Li Wenxuan hesitated, raised his hand and said I will.

Shang Lu nodded and said very well, Uncle Cousin is in charge of filtering.

He then went on to look at the technical documentation and asked, "Who has a background in psychology and neuromedicine?" ”

Shiraki looked left and right, and then whispered, "I studied a little bit in college......"

"Good." Shang Lu ordered her, "Bai Shu is in charge of s." ”

“s？” The girl asked, "Is it ATURE and SCE?" Do we still need to publish articles for this work? ”

"It's the Ervous system, the central nervous system." "One of the core modules of the MEG-BCI system is to monitor brain activity – both mechanical and microelectronic...... This job is given to the great uncle, who is responsible for the maintenance of the machine. ”

Wang Xiangbing nodded.

"What about me?" Zhang Zhong asked, "Comrade Grandpa, what am I responsible for?" ”

Shang Lu looked his tendons up and down, and snapped his fingers: "You are the most important, responsible for carrying the others back when they run away." ”

The engineers of 151 spent a whole day installing and debugging the MEG-BCI system, and Shang Lu asked the others to leave all the metal items and electronic products on their bodies outside before entering the door.

Li Wenxuan curiously touched here and there, especially the huge scanner, and he asked, "What is in here?" ”

"Liquid helium." Shang Lu replied, "Have you seen magnetic resonance?" MEG and TRFMRI are both means of obtaining information about brain activity, and both methods have their own emphasis, real-time functional magnetic resonance imaging has an advantage in spatial resolution, and magnetoencephalography has an advantage in temporal resolution, both by capturing magnetic signals, so they both require superconducting coils. ”

Shiraki sat down in the chair curiously, carefully straightened his back, and stuffed his head into the scanner above his head, the contact surface between the scanner and the skull was an inverted bowl-like concave surface, deep enough to the bridge of Shiraki's nose, and his eyes could not be exposed after the head was stuffed in.

"How fast is the information output of this system?" Shiraki asked.

"It's just the basics, and the output speed is about 60 bits per minute." Shang Lu replied.

"Can I try it now?" Shiraki was intrigued, "Let it guess what's going on in my head." ”

Shang Lu readily agreed.

There was a lengthy initialization process after the MEG-BCI system was turned on, and Shang Lu stood behind the operation panel on the opposite side of the room and asked, "Text message?" ”

The rosy lips under the scanner pursed and said, "Text message." ”

The rest of the people got to the back of Shang Lu's body, there was a flashing cursor on the blank monitor, and the most basic brain-computer interface data output speed was only 60 bits per minute, eight bits were a byte, and two bytes were a Chinese character, which means that it could recognize three words at most a minute.

"How can I imagine that word so that it can tell what I think?" Shiraki asked.

"The system doesn't know you, so it doesn't have a deep learning algorithm for you, so you can only use the most basic libraries." Shang Lu said, "You have to use the general library." ”

"Universal libraries?"

"Everybody's brain activity is different, and if you ask a hundred people to imagine a hen in their heads, each of them may imagine a chicken differently, but the good thing is that words are a definite system of symbols, and for Chinese characters, they have certain characteristics that make everyone have consistency when imagining them." Shang Lu leaned his back against the wall and clasped his hands, "Regardless of gender, young and old, when they imagine this word, they must follow a fixed rule and path, everyone is exactly the same, guess what, what is this characteristic?" ”

Bai Shu thought about it, she was very smart, and immediately reacted:

"It's a stroke."

"That's right, strokes are the most basic rules in this symbol system, and they are consistent and universal, so you only need to imagine the process of writing the word in your head, and the MEG-BCI system will recognize it." Shang Lu said, "This is no different from other BCI systems, they are all the most basic virtual motion imagination." ”

"Okay."

Shiraki began to imagine in his mind the words he wanted to write.

The rest of the people gathered in front of the monitor, waiting for the word to pop up.

But this process is really slow enough, Wang Xiangbing and Li Wenxuan's eyes are sour, and that word is still in difficult birth.

"Can you really go to the battlefield against angels at this speed?" Wang Xiangbing muttered quietly, "The angel has flattened our nest, and it hasn't popped out a fart yet." ”

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

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

"Me".

"Si Guoyi!" Wang Xiangbing turned his head and gave a thumbs up to Shang Lu, "It's really recognizable!" ”

Shang Lu smiled.

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

"Give".

The crowd applauded.

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

Shang Lu explained on the side: "It's not as amazing as you think, it's actually the signal of the oculomotor nerve, you close your eyes and try it yourself, when you write in your head, are your eyeballs also moving?" ”

This is followed by the third word:

"Home".

"What is she writing?" Zhang Zhong asked, "Why can't you string together a sentence?" ”

The fourth word is faster:

"Lu."

One last word:

"Quotient".