"However, this method is not bad, it's better than going back by yourself, at least you won't be late, and you can use this method in the future, instead of checking, and find someone else to replace the obsessive thoughts you have completed."

"Huh? What does that mean? ”

"Like, you want to go back and check the door in your head, don't you?"

"That's right." Hu Peng nodded.

"As long as you make sure the door is locked, the pain will disappear, right?"

Mu Chun said as he scribbled on the paper.

"That's the case, so I would turn back halfway before, as long as I went back to check and make sure that the door was closed, I wouldn't worry about it anymore, and the day was normal. It's like there's never been that restlessness in the subway in the morning. ”

"At this time, as long as you have a reliable person, someone you trust to help you go back and complete the examination. This is called a surrogate test. It is up to the agent to complete the actions that are repeatedly wanted to be checked. ”

Mu Chun put the paper he had just drawn in front of Hu Peng.

The paper is full of circles, squares and triangles.

As with the liver and gallbladder last drawn, I wonder if the whole world in this doctor's mind can be represented by simple geometric figures.

"You see, here's the door, this is your brain, you're on the subway, the timeline is forward, the same direction as the subway track. The location of the home is counted as 0, the subway starts to go in the direction of the big number, and the final 10 is the school. You usually start to get stuck in the cycle of thinking about whether the door is locked or not at 3-5, and then, by the time you reach the number 7, the horror reaches the top, and you usually have to turn back and turn back to 0. ”

"That's right, it's like a drop of rain falling on the window glass at 3, but soon, at 4 and 5, this mood heats up very quickly, the heavy rain comes soon, and by 6 it's unbearable, and at 7 you have to do something, otherwise your stomach is gurgling, your head is buzzing, you can't think about anything, you can't do anything, and you keep sweating, it's embarrassing, am I crazy, I sometimes think like this."

Mu Chun did not answer Hu Peng's question, but drew a rectangle between 3-7.

"This is the action grid, all your thinking dilemmas are contained in an action command, this command is this rectangle, this rectangle needs to move it, put it back to the 0 position, at this time, the dilemma is lifted."

"That's right, that's right, but in fact, the worry is just urging to do that thing, and it's basically that action."

"So you jumped on the subway on the way back, and when you got to the subway on the other side, your whole mind was at least half lighter."

"That's right, that's right."

Hu Peng laughed, "That's it, it's like this, that's right." ”

"There's a problem here, and it's these triangles, which represent [worry] and [fear], pointing to an imaginary fact, that there are thieves in the house, and the door is not locked."

Hu Peng nodded vigorously, and there was already a look of adoration in his eyes.

"When you jump from one subway to another, does the fact that there is a thief in the house and the door not locked] change?"

"No, probably not."

"Yes, the facts haven't changed, because the matter of changing the subway has nothing to do with whether there are thieves in the house, right?"

"Yes, how can it be related?"

Hu Peng also felt that this was something that the second-graders in his class understood.

However, with the change of subway, this fact has changed. It's like if you draw on this piece of paper, and your drawing appears on the wall of your home, in fact, it doesn't matter, and it can't be done. ”

Hu Peng sighed, "That's right, it's completely correct, that's right." ”

"Even if it's not done by you, but by your mother, it's going to change the facts."

"Yes, after my mother agreed to go and see it, I was a lot less worried."

"That's a surrogate check."

"I see."

Mu Chun lay back in his chair, his eyes staring at the ceiling, looking bored.

Obviously he was still drinking champagne happily just now.

"If Mom goes to check, you shouldn't be nervous anymore, and the alarm can be lifted."

Mu Chun muttered to himself, his fingers swimming around the table.

"Yes, for a while I was not nervous at all, especially when my mother said that the door was locked well, I was very relaxed, more relaxed than ever, I thanked my mother, and sent her a red envelope of 200 yuan, and then the third class was the Chinese class, and I didn't remember the door at all in the class.

But the problem was in the fourth class, I didn't know what was wrong, and suddenly I thought about whether my mother didn't lock the door when she went out. ”

"Huh? So mom went in? ”

"Yes, my mother said that since I came, she would help me clean the room, but it turned out that I had a habit of cleanliness, and there was nothing to clean at home, and praised me for my taste, and the carpet was very beautiful."

Mu Chun sighed, "Oh no, why bother with things, just take a look to see if it's locked, open the door and go in again, my mother doesn't go to your house often, what if I don't know how to lock the door, what if I lock it less." ”

Hu Peng felt that he was about to cry, Mu Chun said word for word, that's it, that's it.

"That's why you're here at noon?"

"Well, I'll tell you the truth, Dr. Mu, I really don't know what to do. I feel like my brain is completely broken. ”

"So, hurry up and go to social networking sites and find a suitable partner, mom or something is unreliable. Speaking of which, I haven't watched the update of the little watermelon today, and I could have rested at noon. ”

Hu Peng looked at the time, because he was too irritable, Hu Peng completely ignored that it was the lunch break in the hospital.

"However, since alternative checks are useful, a robot can solve these problems at home. yes, I just thought of it. ”

Mu Chun slapped the table and laughed evilly, "Isn't there such a thing as a home security 360?" It's a networked camera, you just point the camera at the door, and then there seems to be an anti-theft alarm system, posted on the doors and windows, or you buy it, so that you can turn on the mobile phone, you can observe the situation at home at any time, right? ”

"It makes sense, if you can see the situation at home all the time, how can you worry about thieves."

"Yes, and these things are not expensive, and they don't cost much electricity, so it's ...... if you buy a set."