readx;

Chapter 440: Xiaoxian's Wish

In the ward, Lin Hong asked Shu Xiaoxian to face the wall, and then said: "You can make a sound like just now, pay attention, after making a sound, you need to do one thing, that is, listen carefully and see if you can hear the echo of the sound." Pen, Fun, Pavilion www.biquge.info (--Net.)"

Shu Xiaoxian didn't know what Lin Hong wanted to do, she just regarded it as a fun game, and she immediately made a crisp sound.

"Click!"

"How's that, do you hear that?"

Shu Xiaoxian did not answer Lin Hong's words, but continued to make several consecutive sounds, and finally nodded definitively, and said happily:

"I hear you! At first, I didn't pay attention, but the two voices overlapped together, and I listened carefully twice before I heard clearly. ”

The sounds and echoes that are emitted are made at very short intervals, basically in milliseconds. If you think of both of these voices as someone speaking, it is equivalent to a person speaking at a very fast pace.

Normal human ears can't tell the subtle differences. Blind people are relatively better, and if others speak at a normal pace, they will feel very slow. In this regard, their ears are much more sensitive than normal, and by fast-forwarding the tape several times faster, they can tell what is being said.

"Very good!" Lin Hong didn't forget to give Shu Xiaoxian encouragement in time, "Next, you turn left, change directions, and then listen carefully in the way you just did." This time, not only do you have to listen to the echo, but you also have to compare the echo you heard this time with the last time you heard it, and notice the difference between the two sounds. ”

Shu Xiaoxian immediately turned left with great interest, and then repeated the previous steps until she really heard the echo clearly.

"How? See the difference? ”

"Seems to be about the same." Her brow furrowed, "Brother, will there be a difference between these two voices?" I can't hear it. ”

"Xiaoxian, don't worry, take your time, you may be a little unfamiliar with it at the beginning." Lin Hong patiently encouraged, "With your ability, you will definitely be able to hear, come on!" Otherwise, you put your hands next to your mouth......"

Lin Hong thought for a moment and taught her a temporary method, asking her to use her hands as megaphones, wrap them around her mouth, and then make a sound like just now.

This time, a smile bloomed again on Shu Xiaoxian's little face.

"Brother, I hear you! This time, it doesn't seem to be as ...... as last time So ......"

Speaking of which, Shu Xiaoxian was stuck, she really couldn't describe the difference between these two voices, she was still young after all, and she lacked vocabulary.

Lin Hong smiled: "You don't need to describe it, just remember it yourself." ”

"Oh!" Shu Xiaoxian nodded, "Brother, is this the game we are going to play?" What's the use of me remembering this? ”

Lin Hong did not answer her question directly this time, but asked rhetorically:

"Xiaoxian, do you want to see things again?"

"Of course!" She nodded heavily, pointed her finger at her little baby fat face, and said, "Brother, do you know, my biggest wish is to go to Mount Tai to watch the sunrise, my mother said, the sunrise there is the most beautiful, the largest and the roundest!" It's a pity that Xiaoxian can't see it, and I can only see black things every day now......"

As soon as she said this, Shu Xiaoxian's mood became low again, and her little mouth pouted.

"Mom and dad are gone...... They don't want Xiaoxian anymore......" As she spoke, Shu Xiaoxian's mouth flattened, her voice was a little choked, and her big and round eyes were filled with tears for a while.

Lin Hong didn't expect her words to cause such a big reaction, and secretly blamed herself, she couldn't even open the pot, and hurriedly comforted her, and finally recovered her from her sad mood.

"Xiaoxian, the game that my brother just played with you is called echolocation. Do you know bats? ”

"Bats? I heard my mom say that it's my mom now, and she said that bats are very powerful, they can fly fast without eyes, and they can't hit anything, I wish I could be like a bat! "Children's emotions come and go quickly, and attention can be easily diverted.

Lin Hong continued to ask, "Then do you know how bats can see without using their eyes?" ”

Shu Xiaoxian tilted her little head and thought for a while, and finally shook her head: "I don't know, my mother didn't say it." ”

"It uses sound waves to see things. It's what I just said about echolocation. When it flies, it emits a special kind of scream from the inside of its mouth, and then discovers what is ahead of it based on the echo of this scream. ”

"Is that so? That's amazing! Shu Xiaoxian didn't really understand what Lin Hong said.

"Actually, you can also learn the same way as a bat, and see things with sound."

Shu Xiaoxian was stunned, and then said, "Brother, are you telling the truth?" Can I really look at things with sound like a bat? ”

"Of course, my brother didn't lie to you, because my brother has this skill, and now, I plan to teach you this skill, are you willing to learn it?"

"Yes, yes!" She hurriedly nodded heavily, "Brother, there are a hundred immortals, not ten thousand!" ”

Lin Hong decided to give her some vaccinations first, but don't give up halfway at that time.

So he said: "Xiaoxian, it's not easy to learn this skill, you need to study and train hard, it may be a little boring, can you stick to it?" ”

"I can! Absolutely! Shu Xiaoxian hurriedly patted her chest and promised, "Brother, I will do whatever you ask me to do, I will definitely be obedient!" ”

"Well, I believe in you! Let's go ahead and test it as we did earlier. The sound in your mouth is like the scream of a bat, and if you hit an object in front of you, it will bounce back, and you can think of it as if it were a ball. It is important to know that the reflected sound will be different depending on the thing......"

Lin Hong carefully explained the principle to Shu Xiaoxian.

may be the key to whether she can see things, Shu Xiaoxian listened very carefully, and remembered every word Lin Hong said as much as possible. Her memory is good, so that's no longer a problem.

Lin Hong first asked her to face the wall, the glass, and the door, and the position she stood in the same position, only changing the object in front of her that reflected the sound waves, and then asked her to listen carefully to the echo and distinguish the difference.

may have understood the principle of this, this time, Shu Xiaoxian's success rate of distinguishing has increased greatly, and she can easily distinguish which type of thing in front of her is.

In her words, the sound waves reflected by the walls are duller than those reflected by the glass, and the open door creates a special echo, as if there is a sound vibrating back and forth in front of it.

After she got acquainted, Lin Hong began to do the test, asking her to spin in a circle, then randomly shouting to stop, and finally asking her to tell what was in front of her, whether it was a wall, glass, or a wall with a door.

This went very smoothly, and Shu Xiaoxian was able to accurately distinguish these three different wall types very quickly.

The success of this step made Shu Xiaoxian feel very excited, she had never thought that she could use this way to identify objects in front of her. Now, just by making a single voice, you can tell yourself where there is a wall and where there is a door, without using other people's eyes, which is amazing!

What made her even more excited was that after a few more trainings, she seemed to really see a wall in front of her. Although Lin Hong told her that it was just an illusion on her part, it was just the effect of the brain's automatic completion of objects, but she didn't care, anyway, in this way, she could "see" things, which also showed that her brother didn't lie to her, and there was really a way to let herself see things again.

Then, Lin Hong directly removed the plastic pad that a nurse used to keep a diary hanging on the top of the bed, and then started another training.

"Xiaoxian, the next training we are going to start is a little more complicated than just now, I will have an object around you, and then you can tell which way it is in you by sound. This thing is a little baffle. ”

"Let me touch it." Shu Xiaoxian uttered the mantra she often said.

Without eyes, she can only see the shape and surface of objects by touching.

Lin Hong familiarized her with the plastic pad about the size of A4 paper, and then began to train.

First of all, he directly placed the plastic plate directly in front of Shu Xiaoxian's face about fifty centimeters, and then asked her to make a sound and listen to the echo.

After she heard it once, Lin Hong removed the baffle, and then asked her to compare the abnormalities between them, and told her when there was a quick baffle in front, and even let her hand stretch out, touch it, and feel where it is.

This time, it went well, and Shu Xiaoxian seemed to have mastered the corresponding knack, and she could quickly tell the difference between having a baffle and not having it.

Then, Lin Hongzai placed the baffle on her right, parallel to her head, also at a distance of fifty centimeters. Follow the previous comparison, and ask her to remember the difference between having a bezel on the right and not having one.

And so on, and the training in six directions, up, down, left, right, front and back.

In the end, Lin Hong began to inspect and test it, he didn't tell Shu Xiaoxian where to put the baffle, randomly selected one, and then let her judge the position of the baffle by herself.

The final result made both of them very happy, except for the position in the back Shu Xiaoxian could not accurately distinguish, the other five positions, she was basically able to accurately report the results.