Liars' brains 'are not the same'


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Habitual liars' brains differ from those of honest people, a study says.

A University of Southern California team studied 49 people and found those known to be pathological liars had up to 26% more white matter than others.

White matter transmits information and grey matter processes it. Having more white matter in the prefrontal cortex may aid lying, the researchers said,

But the British Journal of Psychiatry said there were likely to be more differences in the brains of liars.

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Very interesting, didn't know different appearances of matter in the human brain appeared. When it comes to females, i wonder how much white matter i have accumulated over the years? :whistle:

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i always imagined lying (in normal people) to appear in brain scans. it takes effort to produce lies, to keep them consistent and coherent, etc. that should cause blood flow to increase and increase in certain areas of the brain. some studies showed this.

recent one: http://www.usatoday.com/tech/science/disco...-detector_x.htm

pathological lying would be different since, one would presume, the effort is less conscious. it's certainly interesting to see that it may be due to the amount of white matter. the related implication to autism is also fascinating.

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So bascially lying, which in turn causes brief thinking action on the brain, increases blood flow?

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it makes sense.

The MRI images show that more blood flows to parts of the brain associated with anxiety and impulse control when people lie. More blood also flows to the part of the brain handling multitasking because it is hard for people to keep track of lies they have told.
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it makes sense.

Yea, it does.

The MRI images show that more blood flows to parts of the brain associated with anxiety and impulse control when people lie. More blood also flows to the part of the brain handling multitasking because it is hard for people to keep track of lies they have told.

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Does adrenaline play a part in blood flow to the brain? I guess that may depend on if it is lying, or given a certain situation that a person is in?

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Also, the frontal cortex is heavily responsible for what is considered "pre-thought". That is it is where past learned knowledge is utilized in forming an action. This would make sense as a lie would need to be created and past knowledge would be pulled to create the lie. Contrasted with a truthful statement which would need far less processing, since it simply "is" and not manufactured.

Interestingly, the frontal cortex is also responsible for impulse control and studies have shown that kids with AD/HD often have some form of dysfunction in that area. This would explain their inability to use past behavioral ramifications in formulating future behaviors.

Also, want to bet which part of the brain is first to become suppressed when alcohol is applied? This would explain why, although alcohol is depressant, most people int eh early stages of drinking begin to act overly hyper and energetic. The part of the brain which is usually suppressing every impulse or urge a person has is going to sleep, so to speak.

That area of your brain is essentially responsible for how we act "civilized" in society. It pulls together all the morals, rules, values, behavioral consequences, etc., of the past to formulate future thoughts or behaviors.

This concludes my lecture on the Behavioral Ramifications of Frontal Cortex Dysfunctions, class dismissed. (Man, I miss teaching..)

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Interesting... there was this test they created which would tell if someone was a murderer or not. It worked by showing the person pictures of the murder scene.

They measure the breain activity. If the guy had ever seen the scene of the crime, a certain part of the brain would trigger. If he never saw the picture, another part of the brain registered. That way they could tell if someone was at the scene and did the act. There's a court case going on right now about whether to allow this in criminal trials or not.

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