Lu Nan, Shen Cheng and Du Lei are all fighting against the masterminds behind the scenes in different fields, and I was in the hospital for a rare three days of leisure. Shen Nuo's body slowly recovered, and I finally decided to take her out of the hospital, Shen Nuo was very happy, and when she changed into her favorite dress, she suddenly cried.

She covered her face and sobbed. She said she thought she would never be able to go out with me again, and she thought she would wear a hospital gown for the rest of her life. When we helped Shen Nuo out, the warmth was thick, the sun was shining on Shen Nuo's pale face, and when she laughed, it was very beautiful.

Until I got in the car, Shen Cheng still didn't call me. Shen Nuo asked me what happened during this time, I thought about it, let her recuperate first, and tell her when she is better. Shen Nuo is a victim, she has the right to know everything, but, not now, I'm afraid she won't be able to bear it.

This tragedy has already begun, and it is not known when it will end, and no one knows if it will end.

My eyelids kept beating fast, and it seemed like it would be a long case investigation, but when I counted it, there were not many mysteries. We are always preparing, because no one knows if the showdown with the mastermind behind the scenes will come in a hurry. Shen Nuo and I sat together, and Liu Jia sat across from us.

Shen Nuo rested her head on my shoulder and fell asleep contentedly, I gently stroked her hair and sighed. When I turned my head, I saw Liu Jia looking at me with a smile on the corner of her mouth. And she gently told me not to deceive my heart. I didn't answer.

Late at night, when everyone was asleep, my phone rang. I quickly picked up my phone, it was Shen Cheng calling. In the carriages, there was only the roar of the running trains, and almost everyone fell asleep peacefully. Only the plainclothes policemen who protected us kept their eyes open.

I stood up and asked the policemen to keep an eye on Shen Nuo and Liu Jia and not let them have an accident, and then I walked to the aisle connecting the carriages, where there was no one. When I was talking to Shen Cheng, my eyes didn't leave Shen Nuo and Liu Jia, and I looked at them from a distance.

I asked Shen Cheng how it was, and Shen Cheng said that he and Tang Yingxuan had already taken the last train and would arrive in G City tomorrow. I was slightly stunned, and asked in surprise: "The case is solved?" "This question seems a bit redundant, if the case is not solved, Shen Cheng will definitely not leave S County.

Shen Cheng told me that the case was indeed solved, but it was very difficult to solve, he had analyzed the suspect's means of committing the crime, and it was recognized by psychological experts and biological experts, but when searching for evidence, it was extremely difficult, and he could hardly find any evidence that could prove the suspect's guilt.

Therefore, he finally put all his hope on the confession of the suspect. Shen Cheng said that he interrogated the suspect for four or five hours, and the pace of the interrogation was sometimes fast and slow, sometimes tough, sometimes soft, and finally broke through the suspect's psychological defense line and found loopholes.

Next, Shen Cheng grabbed the loophole and finally got the suspect's guilty confession, except for the illegal interrogation method of extorting confessions by torture, Shen Cheng used all the means he could use. Shen Cheng said that he is the leader of the task force, and in order to make the truth known to the public, he will no longer investigate in the wild as before, leaving a handle for the truth to be announced.

I can trust Shen Cheng, but I still have some doubts: "Biology expert? How does it have to do with biology? ”

I can understand that it has something to do with psychology, because almost any crime and investigation is inseparable from the application of psychology. I firmly believe that any discipline can be a tool for crime, but I don't understand how Zhu Li's case has anything to do with biology.

Shen Cheng no longer played tricks, and he talked to me about his process of solving the case and reasoning. Ever since I talked to Shen Cheng, Shen Cheng has basically determined that this is a case of induced suicide. The only question is how the murderer induced Zhu Li. Shen Cheng thought that most cases of induced suicide were indeed carried out through words.

However, Shen Cheng does not rule out other ways. The so-called induced suicide is not considered a suicide case, but a murder case, suicide, just in terms of criminal methods. Shen Cheng strung together all the clues he had collected, and in the end, Shen Cheng focused on the telescope.

The telescope is a visual tool, so Shen admits that the suspect may have been induced by vision. He said that Zhu Li is a mentally ill person, his thinking is completely broken, and he has no ability to judge, so he will not distinguish whether what he sees is right or wrong, and whether he can apply it to himself.

I interjected: "You mean that the suspect deliberately let Zhu Li see his suicide, and then let him go to school?" ”

Shen Cheng was sure: "That's right, this is a parody suicide." ”

I shook my head and replied: "Every case of the mastermind behind the scenes is very carefully arranged, and it is indeed not impossible for Zhu Li to imitate the action of suicide, but there is little hope, I don't think that the murderer will kill Zhu Li with such a successful and unknown means." ”

"The probability of success in imitation suicide is indeed close to zero, but have you thought about it, what if it is a conditioned reflex?" Shen Cheng asked me rhetorically.

I was stunned, I vaguely understood what Shen Cheng was going to say to me, and I also knew why this case had something to do with biology. Reflexes are basic neuromotor movements, which are generally considered to be divided into unconditioned reflexes and conditioned reflexes. The so-called unconditioned reflex is innate to people, generally not affected by external factors, it is an instinct, such as baby suckling, and conditioned reflex refers to the acquired mental reflex, which requires external conditions, such as people learn to read and write.

Shen Cheng told me that Zhu Li's case was a murder case that used conditioned reflexes.

The process of conditioned reflex generally requires information input, information digestion, and finally information output.

Shen Cheng said that the suspect had also confessed, she would wear red clothes every day on the rooftop, and then pick up a fruit knife, wipe it on her neck, and pretend to dance, she gave Zhu Li the telescope, and when no one was around, she taught Zhu Li to use the telescope to see the location of the rooftop.

Zhu Li saw that the suspect was wearing a woman's red dress and wiping his neck, which was information input.

Over time, Zhu Li would watch the suspect's performance at a fixed time every day, and slowly, this became a habit of Zhu Li, that is, a simple conditioned reflex. Zhu Li has just lost his ability to judge, but some people's most basic instincts, such as the ability to learn, have not been lost.

Learning this behavior is called the digestion of information by Shen Cheng.

And Zhu Li imitated this behavior, put on a red coat and wiped his neck to commit suicide, which is the output of information input and digestion.

Shen Cheng emphasized again: "This is a murder case that uses conditioned reflexes. ”

Shen Cheng said that the suspect demonstrated his actions at a fixed time every day in order to make the input of information more regular and easy for Zhu Li to accept. Moreover, the suspect also said that the actions she demonstrated were exactly the same every time, which was also to prevent errors in information input.

The location was deliberately chosen by the suspect, and there, she could guarantee that only Zhu Li could see her. The distance was too far, and Zhu Li was given a telescope, also so that Zhu Li could see the details of her every move, and the suspect also confessed, and the telescope was also taken by her suspiciously.

"The murderer is so sure that the conditioned reflex can be formed." I still think that the success rate of this kind of high-IQ crime that takes advantage of people's conditioned reflexes is too low.

"This is because the murderer has already figured out Zhu Li's situation." Shen Cheng said to me.

Zhu Li is a mentally ill person, although mental illness and dementia cannot be confused, but severe mental illness often makes people's IQ decrease. Zhu Li is a good example, although he is mentally ill, but all kinds of performances are like a fool.

Shen Cheng said that Zhu Li's IQ may not be as good as that of a six-year-old child, in other words, Zhu Li's mental age has become very young.