单项选择题
As is reported that all today’s polygraphs record are pulse, respiration, skin temperature, and other signs. All these may indicate whether someone looks nervous or not when being asked a cursed question.
Maybe machines can be cheated, but it may not always be so stupid.
"I suppose that controlling brain blood flow may be much more difficult," says Dr Daniel Langleben, an assistant professor of psychiatry at the University of Pennsylvania Medical School.
Doctor Langleben, as well as his co-workers, has experimented with brain scans which is computerized-functional magnetic resonance imaging. The amount of blood flow to different sections of the brain can be shown by this huge machine in exact details. The purpose for their experiment is that they wanted to know whether changes could be measured inside the brain when people are deceitful. They asked people to tell lies inside the scanner and lie by their teeth. When combining answers from many test subjects and, meanwhile, averaging them by a computer, they clearly discover that when people lie, they use more sections of the brain compared with telling the truth. That is to say, people may naturally be honest. The brain works harder when it tells lies.
A. The giant machine could show different sections of the brain.
B. When people tell the truth, they use less sections of the brain than lying.
C. When you are lying, less sections of your brain are used.
D. The machine can always be fooled.