Zhang Quanbao had nothing to do today, so he went to the medical school to listen to Wang Yi's lecture.

His younger brother Zhang Quande is not at home all day now, although he is still nominally the head of the Octagonal Terrace, but he has no generals, so he runs to Wang Yi's martial arts school base every day and bubbles up the library inside. Inside, I not only read the Central Plains military books, but also read Western war strategies, and I saw that there was a tendency to become a master of military theory. When he was tired of studying, he took Xiang Long and Zheng Haitao to the shooting range to shoot a few shots. Sometimes he would play a military chess exercise with Wu Xiao and other cadres from the staff department on the sand table. Look at the posture of pointing out the country and strategizing, don't say it, it's quite like Zhang Fei is alive! Zhang Quande is a good person, that is, he never contacts other insurance team members in private, and he is afraid of violating Wang Yi's taboo. Although this person is five big and three thick, as reckless as Brother Biao, he is actually very measured, knows how to advance and retreat, and Wang Yi is quite relieved to him.

"Okay, so this is the MRI picture I mentioned to you yesterday, it's 60,000 times the Earth's magnetic field, it's the difference between oxygenated heme and heme, and positron tomography calculates glucose metabolism. To put it simply, we can tell which areas of the brain are working by the colors on the guò diagram, and the red part is working, followed by yellow, and blue-green is not working. You can see that on this MRI picture of the brain, the colors are shown very clearly. This is a real person who was tested, lying flat in the machine qì with his eyes open and not thinking about anything, so we see that his visual cortex area is bright (red). ”

Wang Yi pointed out the relevant area with a teaching whip, and the lecture hall was full of people, all of whom were Wang Yi's students in medical school. At this time, the classroom was silent, and everyone listened attentively to Wang Yi's explanation.

"The second flip chart shows a person's reaction when they see an ordinary stranger, because we don't have any emotions with strangers, so our brain basically doesn't react. The third wall chart shows the reaction of a person when he sees his lover - husband, wife, children, friends, etc., and we can clearly see that the brain immediately lights up, and the red and yellow areas increase dramatically. ”

The students in the audience nodded unconsciously, Wang Yi spoke quickly, and there was nothing difficult to understand here.

"Below we see an MRI of the brains of identical twins doing the same thing. We have already talked about simple genetics in the previous lessons, and we all know that identical twins have the same genes, in other words, they are born with exactly the same brain. Then we can see that the areas that light up on the two MRI images are completely different, indicating that the two brains react differently when faced with the same thing. ”

Wang Yi's speech speed was very fast before, but at this time, he slowed down, from facing the blackboard to facing everyone, and deliberately accentuated his tone: "Zero to three years old is the development period of the brain. Zero to six years old is a period of personality development for a person. From the picture of identical twins, we can see that even if the brains are identical, because of the differences in acquired experience, the twins will still have different reactions when faced with the same thing. Therefore, as a parent, don't always compare your children to each other, which will not benefit your children's growth in the slightest. You can discipline him, but you can't insult him! ”

"It's the hippocampus in the brain, and it's our memories that are responsible. This is the cell in the hippocampus of the abused child, this is the cell of a normal person, and we can clearly see that the cells in the hippocampus of the abused child have shrunk significantly. Not only that, the corpus callosum of the abused child becomes smaller, and the connection between the left and right brains is far less than that of normal people. Note! Abuse can be inherited from offspring, and there have been cases of this. A woman often pricked her baby with a needle, and the child was later pricked to death. At that time, everyone was shocked that this mother was sinister and vicious, but later someone investigated the woman's origins. found out that she was raped by her stepfather since she was a child, until she understood what was going on, so she reported it to the authorities. The stepfather, of course, was arrested and sentenced. The aggrieved girl thought that when she encountered such a thing, her biological mother would comfort her and complain that she didn't take good care of her. didn't expect this fucking girl to beat her up violently and scold her for being a slut, just because of her denunciation, she lost the care of that despicable man. ”

Among the students, Zhang Quanbao listened to Wang Yi's eloquent talk about the case, and his eyes seemed to open up little by little. "It turns out that the human brain still has such a secret."

"Here's a comparison of the brains of depressed and hyperactive children, and we can see that the brains of people with depression are blue-green. Some people have thought that the brain of an ADHD person should be the opposite of that of a hypochondriac, but this is not the case! We can see that the brain map of hyperactive children is also blue-green, not red-yellow as some people once thought, so we are now treating hyperactive children with drugs for depression. ”

"Next is the brains of men and women, under the microscope, the visual systems of men and women are completely different, at the level of the striatal cortex, men are mainly magno large cells, women are parvo small cells, so men see objects more holistically, while women pay attention to details. In addition, the corpus callosum, which connects the two brains, is thicker for women than for men, and when men speak, only the left brain works, and women work on both sides, the left brain is the reason, and the right brain is the emotion, so when women speak, they prefer to express their feelings. Men secrete serum amines faster in the brain than women. Serum amine, also known as serum zhangsu, is actually serotonin, which has a sedative effect on the human body. So we often see a scene in life that is a husband and wife quarreling at night, and the man falls asleep after the quarrel, thinking that the matter is over and it is over. But the wife has always been unrelenting, and she is even more angry when she sees her husband asleep. The reason for this lies in the speed of serum amine secretion! ”

The students laughed heartily when they heard this.

"The drug mechanism we use to treat depression is to inhibit the absorption of serum amines, and everyone will leave an impression, and we will talk about it in pharmacology later." Wang Yi took a sip of water, and then said: "This is a picture of the brain of an autistic person, and this picture next to it is a picture of a normal person." We can see that when a normal person looks at a person, this part of the human brain lights up, while when a patient with autism looks at a person, this part does not respond, and it is another part that lights up. What is this part of the tube? …… Inanimate, what is inanimate? It's a table, a chair and something like that, so people with autism can't distinguish people's expressions. Pathological anatomical cases have shown that the nerve cells of autistic patients are half of those of normal people, and the nerve fibers are only one-fifth of those of ordinary people. ”

At this time, a student muttered in a low voice, "In their eyes, we are lifeless?" ”

Wang Yi shook his head and said earnestly: "It's not their fault. Not long ago, there was a boy with mild autism, and when his father found out about it, he felt that the child was a disgrace to the family, so he ignored him in his life. He never looked at his son, and even when he spoke, his gaze was always over his head. Later, when the family was watching a neighborhood sports day, one person broke the record, which in English is "break-the-record". My father was a sports fan himself, so he cheered excitedly, seemed very excited, and shouted along with everyone - he broke the record. The son watched from the sidelines, not understanding what his father meant by breaking the record in English, and thinking that the word record (which also means record) was the family's newly bought record. So when he saw that his father was happy, he ran home and smashed all the new records that his father had bought with a stick. Then he proudly dragged his father home, and according to his imagination, he would praise him. But the reality is quite the opposite! The father didn't think about why the child did this, he thought the child was a scourge and a madman, so he beat him up. Since then, the child has become a severe affective disorder! It can be said that it is very pitiful. ”

The students under the podium all looked sorry, and some of them had clenched their hands into fists because they hated the father.

"I often say that parents are a bunch of bastards! They all think that they are thinking about their children, but they don't know that they are the ones who harm their children the most. Parents never put themselves in their children's shoes. When catching up with the big market, the parents took the children out, saying that they were taking them to see the excitement, but they didn't expect the children to go home after walking for a while. Parents beat up their child for this, thinking that if he is disobedient, he will know that he is in trouble! But they didn't think that the height of a child is only the height of an adult's thigh, do you like to be squeezed around in a pile of ass? ”

Wang Yi smiled at this time and said, "Oh, I said a bunch of digressions in excitement." Let's move on...... Europeans always say that we humans only use 10% of our brains, and here I can tell you that we are farting, nothing at all. To take the simplest example, this is the visual center, this is the auditory center, and the two are very close to each other. Children with congenital cataracts are born unable to see objects, but in order to save money, the parents at home performed cataract removal surgery for their children after a gap of two years. However, the operation was successful and the cataract was successfully removed, but the child's vision was not restored. The reason is that the visual center and the auditory center are gradually developed, but because the child cannot see things and has no visual stimulation after birth, the place that should belong to the visual center is occupied by the expansion of the auditory center. So there are no useless areas in the human brain at all, and as long as they are useless, they will be occupied by other functional centers...... In addition, the right-brain revolution advocated by some people is also completely deceptive, the left and right brains are a whole, unless the other half is cut off, otherwise there is no problem of activating or not activating...... What you see now are the neurons (nerve cells) of the kitten, which are the neurons of the old cat. The synapses on the neurons of kittens are these things that look like tentacles, thin and dense. The old cat's are few and thick. Synapses are actually the same as grassland dirt roads, the roads that are often taken will be widened, and the roads that are not taken will be narrowed, and finally they will be flooded by wild grasses. The neurons of the kitten represent an infinite possibility, and although the road is small, it leads in all directions, which is the expression of imagination and creative power. And the old cat represents a kind of right speed and accurate response, but at the cost of losing the power and imagination, so don't always ask the child to endorse, this is killing the child's imagination and imagination! ……”

After class, Zhang Quanbao and a group of students surrounded Wang Yi in the center and asked various questions about the human brain. Because many of them involve education-related theories, Wang Yi also answered in detail. The next course is human anatomy, but today is more special because today is the first class of human anatomy in medical school.

When he came to the door of the real yàn room, the old iron hook saw Wang Yi hurriedly smiled and saluted, and said, "Sir, you are here." ”

"Here we are." Wang Yi smiled and nodded, then asked back, "Are you ready?" ”

The old iron hook smiled: "Okay! ”

The old iron hook was originally a puppet, in his fifties, but because of his bad legs, he quit his job as a yamen. In addition, there was no one at home and no heirs, so he was invited by Wang Yi to be the caretaker and teacher of the dissecting room. Because he usually used a long iron hook as a walking stick, and by the way, he also used it to hook the corpse in the formalin pool, so the medical students called him Old Iron Hook. Spread outside the school, it is estimated that it is more like a villain in a horror novel. However, the old iron hook himself is actually not bad, he is very kind, he wears a white coat all day long, and chats with the students when he has nothing to do...... Sometimes they drink together, or light a wax in the middle of the night, and compete with the students to tell ghost stories. Therefore, in the eyes of most students, this old man is like a grandfather, and he is very respectful

Pulling open the door of the real room, the smell of formalin wafted out, Wang Yi felt very familiar, and even had the urge to cry the memory. And the trainees also wept, but they were stimulated by formalin. Around the perimeter of the room, there are iron shelves filled with various glassware containing specimens of human organs made of formalin. There are eight iron-framed table test benches in the room, all covered with thick black rubber leather, and four of them have a corpse on them.

One of them, a man and a woman, were from the Qing Dynasty, and they were both male and female bandits captured by Wang's subordinates, and they were full of evil. The other couple was a Tsarist Russian, because they robbed the two chickens of the Qing people, and they happened to be encountered by Wang Yi, so they are now specimens on the test bench.

However, Wang Yi still showed the great feelings of the deceased very well, and led his students to fold their hands and muttered a bunch of words, probably thanking the four corpses for donating their lives for the people and contributing to Chinese medicine.

"The reason why there are four corpses today is that I want you to have two questions. The first man and woman are not different, what is the difference, what is the same. The second Qing people and foreigners are not different, what are the differences, what are the same! Do you understand? ”

The students replied, but their faces were not very good.