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　　If you have read the fairytale about the Italian boy Pinocchio, you will remember that every one knew when he lied because his nose grew．But did you know that your brain can also betray(出卖)you when you tell a lie?

　　A study released last Monday showed that the brains of people who are lying look very different from those who are telling the truth．According to the US researchers, this finding could lead to creating a more accurate lie detector(测谎仪)．

　　“There may be separate areas in the brain involved in truth-telling and cheating that can be measured,” said Scott Faro, head of the research group．

　　Faro and other scientists tested nine volunteers．Six of them were asked to shoot a toy gun and then lie and say they didn't do it．Three others who watched told the truth about what happened．

　　The volunteers were connected to a special machine, which used a strong magnet(磁铁)to provide a real-time picture of brain activity．Clear differences were seen between the liars and the truth-tellers．A total of seven areas were active in the cheating group, but only four in the truth-telling team．

　　“It seemed to take more brain effort to tell the lie than to tell the truth,” Faro said．

　　The traditional lie-detector machine looks at sweat, skin, breathing and heart rate changes．

　　Using such new technology as a lie detector would be expensive, but it might be worthwhile in some criminal cases．

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