How Do Lie Detectors Work?
12/21/2022 8:19:35 AM/cdn.vox-cdn.com/uploads/chorus_asset/file/653650/73507475.0.jpg)
Do you know?
- A lie detector, also known as a polygraph, is a machine that ostensibly determines whether a person is telling the truth.
- During a polygraph test, the lie detector monitors the subject's physiological functions while an expert in psychophysiology interrogates him or her.
Let's explore more in the following passage!
Let's learn some new words before you read the passage:
Listen and complete the passage.
| interrogate | alibi | detect |
| betray | sight | tracks |
| suspect | debate | investigations |
Have you ever wanted to know if someone was lying? In the past, you might have tried reading the person's body language. Is he looking away from you? Is she moving around a lot? That's one way to spot a lie. There's also another way. It's known as a polygraph. You might know it as a lie detector. It's a common in detective movies.
A lie detector does not actually lies. In that way, its own name is a lie. There is no bell that rings ding ding ding when someone is lying. Instead, the lie detector things like a person's breathing, pulse, and blood pressure. It does this while the person is answering questions, usually during police . Certain changes in these measures are supposed to show that a person is probably lying. The idea is that a lying person knows he is lying, so he will feel nervous. This, in turn, will cause changes in his body. It is difficult for people to control these changes, even liars.
Lie detector tests may or may not be totally reliable. Some people believe they work, while others argue that they don't. Despite this , lie detectors are still commonly used by the police. They use them to suspects of a crime. For instance, the detective might ask, "Were you really at the doctor at 3pm on May fifth?" The might say, "Yes," but the lie detector might show that he feels nervous. This is a sign to the police that his is probably a lie. An alibi is the reason that a person uses to argue that he could not have committed a crime.
If you ever are given a polygraph test, it's probably best to tell the truth. No matter how much you want to lie, your body will probably you. Or, just stay out of trouble, and you will never find yourself hooked up to a lie-detecting machine!
Read and answer the following questions.
How Do Lie Detectors Work?
Have you ever wanted to know if someone was lying? In the past, you might have tried reading the person's body language. Is he looking away from you? Is she moving around a lot? That's one way to spot a lie. There's also another way. It's known as a polygraph. You might know it as a lie detector. It's a common sight in detective movies.
A lie detector does not actually detect lies. In that way, its own name is a lie. There is no bell that rings ding ding ding when someone is lying. Instead, the lie detector tracks things like a person's breathing, pulse, and blood pressure. It does this while the person is answering questions, usually during police investigations. Certain changes in these measures are supposed to show that a person is probably lying. The idea is that a lying person knows he is lying, so he will feel nervous. This, in turn, will cause changes in his body. It is difficult for people to control these changes, even liars.
Lie detector tests may or may not be totally reliable. Some people believe they work, while others argue that they don't. Despite this debate, lie detectors are still commonly used by the police. They use them to interrogate suspects of a crime. For instance, the detective might ask, "Were you really at the doctor at 3pm on May fifth?" The suspect might say, "Yes," but the lie detector might show that he feels nervous. This is a sign to the police that his alibi is probably a lie. An alibi is the reason that a person uses to argue that he could not have committed a crime.
If you ever are given a polygraph test, it's probably best to tell the truth. No matter how much you want to lie, your body will probably betray you. Or, just stay out of trouble, and you will never find yourself hooked up to a lie-detecting machine!
In the article, all of the following are mentioned as something that a lie detector can track EXCEPT _____.
- breathing
- blood pressure
- muscular tension
- pulse
According to the text, if a person tells a lie, he will _____.
- control his emotions
- get anxious
- change his facial expression
- run away
What do you know about a lie detector from reading the article?
- Lie detectors have a bell that alerts you when the subject is lying.
- The accuracy of lie detector tests is still under debate.
- The lie detector contributes to the success of detective movies.
- Police often abuse lie detectors during interrogations.
Why does the writer think the name "a lie detector" is a lie?
- Because he is suspicious of the accuracy of lie detectors.
- Because the subject of a lie detector can hide their true thoughts.
- Because a lie detector works in an indirect way to detect lies.
- Because the result of a lie detector has been proven false.
What is the main idea of this article?
- Lie detectors can tell if a person feels nervous, which may indicate that he or she is lying.
- Police should be banned from using lie detectors.
- The accuracy of lie detectors should be considered when used in criminal investigations.
- Lie detectors of the future will be able to read your mind.
Build your vocabulary by learning these intensive phrases/idioms
Rearrange the words in a correct order to make a complete sentence (kéo từng từ/cụm từ về vị trí đúng để tạo thành câu hoàn chỉnh).
Can we _____ to the electricity supply at the campsite?
- hook up
- sweep up
- catch up
- show up
Complete the second sentence, using the word given so that it has a similar meaning to the first sentence. You must use between TWO and FIVE words, including the word given. Do not change the word given.
Lift-off is always important to show whether a new rocket succeeds. (TRUTH)
=> Lift-off is always for a new rocket.