The lie detector is based on human brain waves. Really? Lie detector? It has a long history. Before the modern lie detector appeared, there were various lie detectors in ancient times, such as? Swear? In fact, it is also a kind of polygraph, but the effect is not that great. Modern polygraph can monitor various physiological changes of the subjects in real time, such as breathing, heartbeat, pulse frequency, etc. You know, when a person tells a lie, there will always be a flaw. When it is difficult to judge the subject, the core of the lie detector comes into play: monitoring the subject's brain waves. If it's a sine wave, is it one? Uniform straight line? If so, this person is not lying; If so? The mountains are towering? You can generally tell that this person is lying.
However, the polygraph still has many limitations. I believe everyone has seen that the current polygraph can only say yes? Detect as many lies as possible? , but it is impossible to 100% accurate, because it depends too much on the psychological and physiological reactions of the subjects. If a person really? Heart like a rock? If it is very morbid, the polygraph will lose its function. Many people have seen a movie called Instinct. The criminal in this film escaped the detection of the instrument by virtue of his strong psychological ability.
To sum up, modern lie detectors do rely on brain waves to detect lies.