What does a lie detector do?

Answer 1

A lie detector is designed to detect the small changes in your body when you lie, as opposed to when you tell the truth. For most people, a deliberate lie will cause stress in the nervous system, and this may be seen as changes in pulse rate, breathing, or sweating. More complex instruments (such as an EEG) can detect the changes in the nerve impulses directly, but are harder to interpret.

Answer 2

it helps us to know when people are lying or saying the truth by measuring their pulse ---like to interrogate terrorists k.R.l.

Answer 3

Hmmm I don't know lets put it this way... it detects lies by brain waves and pulse to see if you stress when you hear the question. If you stress it usally means you lied.

Answer 4

to see if u are telling the truth many people use it........couples,husband/wife,and the government :)