June 1st, Children's Day.

Two weeks after the establishment and investment budget of the mechanical exoskeleton project, Zhejiang University BCI (brain-computer interface) Laboratory.

A researcher sat down in front of the screen with a reluctant face. Two colleagues behind him put on his eeg headbands on him with hands and feet, and then turned on the controller one by one to prepare to start the experiment of this day.

"Brother Chen, why are you always me? I really don't look like a guinea pig. Will we draw lots tomorrow? Whoever draws will do the experiment."

The person he called Chen Ge is named Chen Li. He is a doctoral student in biology and electrical engineering. He is a genius who has been seen in a century in the field of BCI. Of course, this technology has not been more than a hundred years since its birth, but no matter what, his talent is obvious to all in China.

"Zhu, don't struggle. Your egg signal is the weakest in our laboratory. You can only achieve the best results if you test it."

"Besides, isn't it easy to just sit here for a day without looking at the data or counting models, just closing your eyes and moving your brain?"

The person sitting in the chair is Zhu Xuan. He is also a computer doctor. He has contributed many breakthrough convolutional neural network algorithm models in the BCI project of Zhejiang University. However, now the experiment has reached the final correction and adjustment stage, and his work has gradually decreased.

So he was naturally regarded as a guinea pig. Every day when he arrived at the laboratory, he was pressed to a chair and put on an egg hood to test their latest robotic arms.

The same is true today. Zhu Xuan started his day's test before he even had time to eat breakfast.

Listening to Chen Li's words, he shook his head left and right and said:

"You are so cruel. The monkey who did the experiment used to do the correct operation and even gave me a banana. Where is me? I sat there all morning and didn't even give me saliva."

"I really don't understand. How different am I from a monkey?"

"...The monkey has grown hair, you haven't grown."

"What if I grow hair too?"

"...... Then I'll give you bananas too. OK, don't pull it. The device is connected. Close your eyes and I'll wear an eye mask for you. I'll correct your mi signal first."

The so-called mi signal is a brain wave signal that imagines the brain wave signal. This signal occurs when the brain tries to direct muscle groups, but the neural pathway is blocked and cannot be transmitted. After the signal is captured through the egg head hood, the brain will input the signal into the decoder. The decoder translates this signal into a mechanical electrical signal based on the mi translation model written by Zhu Xuan and his team, thereby directing the movement of the robotic arm.

Zhu Xuan's arm has been tied firmly to the armrest of the chair, with the purpose of simulating arm disability or loss of arm.

"Every time I sit on this chair, I always feel bad, and I have to wear an eye mask... I always feel like the next second the whip is about to come up."

"......Come, Xiaoya, go and take the candles we prepared."

"Damn it! You're really playing!"

Zhu Xuan's arm suddenly twitched, and the entire chair was pulled by him.

Because of the restriction of the belt, his arm movement was not successfully performed. Instead, the mechanical arm placed aside suddenly contracted, almost rubbing against Chu Ya who was standing aside.

"Senior brother, your reaction is too great... Mi signal transmission is normal, the data strength is OK, you can test it."

"No, I'm not reacting very much, I'm afraid you'll really get candles. I remember you said last time that you should test the ability of reflective signals to command the robotic arm in an unconscious state. Isn't this what you are doing now?"

Chu Ya threw a helpless look at Chen Li, then spoke:

"What should I do? Brother Chen, do you still have candles?"

"Go up, why not? But you have to test the basic operation first. Come on, Zhu, there is an apple in front of you. Imagine moving your arm about twenty centimeters to the right, and then reach out to grab the apple."

"Yes, right, right, right, how about it? Can you feel it?"

Zhu Xuan on the seat put away his joking expression. Under the blindfold, he had closed his eyes and entered a state of contemplation. Then, the robotic arm began to move.

The robotic arm was very fast, and the five knuckles were constantly flexing and stretching, trying to grab the apple in front of him.

"Very good, you've already encountered it. Can you feel the current signal?"

Zhu Xuan nodded slightly and replied:

"The shoulders feel numb, but it is not easy to rebuild this feeling in the brain's logic system. I can't react at all that this current comes from the touch of the robotic arm to the object. It takes a long circle to correct the logic."

"This kind of operation is too counterintuitive. Brother Chen, can you develop a system that converts pressure signals into tactile signals and writes them back into your brain?"

"I'm doing it now. Now this is what the deeploop project does. I just got the budget and wanted to use the supercomputer. After the supercomputer is added, you can try it."

"But you should focus on electrical stimulation now. As long as you have special training, it is not difficult to form conditioned reflexes. Come on, you continue. Now that you have three fingers touching the apple, can you feel the current? Hold it tightly, the current frequency should be faster."

Zhu Xuan nodded and replied:

"I can feel that I should have touched all five fingers now, and the five points that were previously buried have electrical stimulation feedback. The feedback area of ​​the middle finger, thumb, and index finger is the highest frequency, which should be consistent with the logic of the stress."

"Then it's OK. Now hold the apple up and will your arm pressure stimulation area respond?"

"It was a reaction, but it was very exciting and strong. This was not the weight of an apple at all, right?"

Hearing Zhu Xuan's words, Chu Ya and Chen Li looked at each other, and a look of joy appeared on their faces.

Of course this is not an apple. What is now holding on the robotic arm is the spherical end of the dumbbell that Chen Li specially found from the gym.

Their purpose of doing this is purely to verify the real role of the FMA electrical stimulation feedback system on the robotic arm.

Judging from the current results, trained users like Zhu Xuan can completely judge the basic situation of the object they are grasping through electrode stimulation buried in other perceived parts of the body without the help of visual and tactile feedback.

If after long-term training, a complete set of thinking and processing logic is formed for these electrical stimuli, users can even directly judge the shape of the object through the robotic arm, which will bring a leaps and bounds to their technology.

Of course, such training must be difficult, because its essence is to break the inherent thinking logic of human limb control and then re-establish a new set of mechanical-based thinking logic, which is even more difficult than starting to learn from the infant stage.

However, for their users, this difficulty is nothing.

Thinking of this, Chen Li explained:

"This is indeed not an apple, this is a dumbbell. Zhu, you learned it very quickly. It seems that our system is basically available. Come on, put down the dumbbell and we continue to test something else."

"......Brother Chen, I have been sitting on this chair for more than half a month. How can I not learn quickly? Wait, what strange things have you stuffed into my hands?"

"This weight, this shape... Why do I feel like it is cylindrical? The pressure between each finger is almost the same. Wait, I'll change my hand and touch it."

While speaking, Zhu Xuan moved another mechanical arm, slowly approached the object he had already grasped, and began to test the shape of the object with one finger.

This is an extremely counterintuitive behavior and is completely different from the touch operation of a normal person. What he is doing is to use the pressure sensor on a finger to stroke the object on his hand.

After turning his fingers around the object for a while, Zhu Xuan had basically made a judgment in his mind.

"I know what it is."

"It's cylindrical, about ten centimeters long, and it can't be judged for softness, but it's slightly curvaceous... First of all, the strange thing that comes to my mind is the first one, and there is only one answer."

"banana."

"No, Brother Chen, do you really plan to let me eat bananas?"

Chen Li nodded at him with relief, and then spoke:

"You must eat bananas, but it's not just about eating them."

"Come on, now you try to peel the banana peel and put it into your mouth."

"......This is a bit too much Brother Chen. The movements are too meticulous and it's very difficult."

"No matter how detailed it is, we have to do it. Can we expect that there will be no fine movements in our future users' lives? Peeling bananas is very daily. If we can't even do this well, how can our brain computers expect to change other people's lives?"

"Stop talking, open your mouth!"
Chapter completed!