Therefore, the taste of food is the smell, when people chew, the fragrance rises from the back of the throat to the nasal cavity, and the nasal olfactory area is blocked by mucus or swollen nasal mucosa when people chew, and the food will be tasteless.

The man in white casually explained the knowledge of smell and taste, as if he didn't care about the foul smell. But he's wearing a mask, so he shouldn't be able to smell it.

"I see, if An Xiaoya is sick again in the future, she will use this trick!" Xia Chenghao was secretly thinking about other things in his heart at the same time, and he was dedicated to two things.

He had An Xiaoya in his heart, this was something that the man in white didn't know, and it wasn't a situation that was allowed to happen, and these memories should have been erased a long time ago. If any adult on the island knew that the child remembered the past, the child would be cleaned up immediately.

The smart Xia Chenghao just kept pretending, pretending that all the things that should not be remembered had been forgotten, including who he was and where he came from.

This is a small distraction, he quickly returned to the scene of the explanation, every bit of knowledge that the man in white said is greatly related to the future of killing, killing may be with knives and guns, or some kind of special medicine, taste and smell will play a key role in life and death, mastering this knowledge will be designed so that the other party can not detect.

The man in white continued his explanation lightly, "In addition to colds, brain abnormalities or injuries will also affect the sense of smell, and when a person is impulsive or confused, he will lose his original sense of smell judgment, or in the case of psychological suggestion, the sense of smell will become sensitive or dull. ”

Xia Chenghao really began to feel that his nose was a little numb, and the stench emitted by the corpse was not as heavy as it was at the beginning, for the sense of smell, psychological suggestion is the most direct control method, and it is often the most effective method.

"The olfactory center gets tired easily, so if you put yourself in a specific environment, you won't notice the smell."

In fact, this has an extremely important internal relationship with murder, so that the other party is in the same specific environment for a long time, and he can no longer detect the sensitive smell when he is really in danger. It's like if you stay in a stinking environment for a few weeks and you don't feel anything out of the ordinary, but you can't stand it as a newcomer.

"People can distinguish about 4,000 different smells, and you, everyone in the barbed wire of the Fire Planet, are at least 6,000."

I thought it was already very powerful to say this, but I didn't expect the man in white to change his words, "However, any dog can distinguish more than 100,000 flavors." So don't have a special smell in front of the dog, so that the first person to be exposed is yourself and not the enemy. ”

Then came a snap, "Stick your tongue out!" ”

Xia Chenghao was the closest, and it was always him who was unlucky, so he had to open his mouth obediently, stick out his tongue like a dog, feel the cold blade with corpse water quickly plucking on his tongue, and pray that the man in white would not miss.

"There are four original flavors, which are sweet, sour, bitter and salty."

The man in white smoothly elaborated that different parts of the tongue surface are not the same as the sensitivity to taste stimulation, the tip is sensitive to sweetness, while the sides are sensitive to acid, and the taste is maximized between twenty or thirty degrees. ”

The man in white said for most of the day before he let go of his knife, Xia Chenghao swung his tongue from side to side, still a little stiff.

"So, if you had to get rid of a feeling, you would have chosen smell or taste, but if your opponent killed you in the previous way, you'd rather not have your eyes or even your limbs."

The man in white said in one sentence that he was trembling for a long time, and the final conclusion that he could draw was that the sense of smell and taste is very important, the basis of survival, and the foundation of being able to save life as a cleaner.

"The eyes are called the windows of the mind, but the real window is the pupil. All mental activity will be involuntarily exposed from here. The man in white gently swept the corpse's two wide-eyed eyes with his knife, and his pupils had dilated to the point that they could no longer be large and had lost their proper color.

"Only the pupil can respond quickly to the nervous system, and any disease in the body will also manifest itself here. Reactions to life and death are here, and as a killer, protecting your pupils is an extremely important job. ”

The man in white lit up the black hole in the middle of one of his eyes.

"Miosis, which indicates that he may have been poisoned by certain drugs, and extreme mitosis indicates a lesion of the tegmentum pontine. The slow movement of the eyeball to the sides indicates that the pontine memphlons function is relatively intact, and the dilated pupils and the loss of light reflex indicate that there may be a midbrain lesion, but if the eyes are so large, it can only be a dead person. ”

As soon as he finished speaking, an eyeball was gouged out by him and bounced into Xia Chenghao's arms.

Half an hour later, the fingers of the man in white tapped lightly on the bare head, Xia Chenghao didn't dare to say a word, his scalp began to become numb and itchy, as if the man in white knocked not the corpse but him.

"Are you itching your scalp right now?" The man in white asked suddenly.

Xia Chenghao reached out and touched his head and tapped it lightly.

"Situational experience is an important brain function." The man in white looked around at the children and continued to return to his topic, "I have been beaten before, and when I see a similar situation, I will reproduce the physiological reaction at that time again and use it to strengthen my memory. ”

If you deliberately let your brain replay a scene, it can make the memory extremely deep. Xia Chenghao lowered his hand and recalled the knowledge in the book, and his brain subconsciously emphasized that he could even recognize the illusory as reality.

There was a slight smile in the eyes of the man in white, and his tone softened: "This shows two things, one is that if you need to remember something, repeat it more; Second, if you can't let others write down you, then there is a way to make him lose the opportunity to repeat. ”

Xia Chenghao listened to every sentence that had nothing to do with the killer on the surface, but he firmly remembered in his heart the slightest possible connection between the body and the killer.

The man in white sighed and shook his head, and suddenly his tone became cold, "However, what everyone needs to know is how to seize the time in the way of mental performance to turn the feeling of inspiration into an inherent reaction of the body in the shortest possible time. ”

"Only by tempering can we make good steel, and only by long-term tempering can we form a conditioned reflex. This ability should be imprinted in every cell of your body, not here. The man in white clucked his knife on the corpse's head.

"The more advanced medicine is, the more organs can be replaced, the heart, liver, spleen, lungs, kidneys, hands and feet, plus face, it doesn't matter if they are all changed, you are still you. But if this place is changed, you will be another person, so the most complete way to take someone's life is to remove the head. The cold light flashed in the hand of the man in white, and the head of the corpse rolled to the ground.