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Old Aug 15, 2009 | 4:51 am
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Last edited by Bart; Sep 18, 2009 at 6:24 pm
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Old Aug 15, 2009 | 6:07 am
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The other thing is that people who don't know or care that their information is false won't "lie" as far as the machine is concerned.

http://www.newyorker.com/reporting/2...fa_fact_talbot -> really excellent article on lie detection through the ages.
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Old Aug 15, 2009 | 9:41 am
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Originally Posted by Bart
A person who convinces himself that he is telling the truth can pass the polygraph. The polygraph is a pretty good litmus test for lying; however, there are a lot of factors that come into play such as whether or not the person is jacked up on caffeine, whether or not the person had a good night's sleep, whether or not the person is currently under stress (or duress), etc. The polygrapher needs to know these factors in order to establish an accurate baseline.

Otherwise, without a deliberate, systematic approach, it is, as you pointed out, voodoo.
Bart -- As I know you know, the principal value of a polygraph is that people will get spooked by all the technology, straps, wires, etc, and voluntarily spill their guts to the examiner.
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Old Aug 15, 2009 | 11:00 am
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Old Aug 15, 2009 | 11:23 am
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Originally Posted by Bart
A good liar will defeat it. Thing is, there are very few people who can really lie. There are a lot who think they can lie, but very few who can pull it off. It's not the machine, it's the examiner.
This isn't actually true. There may be very few who know how but anyone could be taught how. They're just simple biological tricks to raising your blood pressure, causing sweating, etc. It's true that it's the examiner since the whole thing is an act anyways and the machine is just a prop.

Replace lie-detector in this paragraph with any other pseudo-science like acupuncture or dianetics. "It's not the machine it's the examiner" is a classic way to weasel out of any failure. You can always claim that well, the tester was doing it wrong. If there's no actual method to the process, just the tester's instincts then there's nothing that can be disproved.
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Old Aug 15, 2009 | 7:02 pm
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Originally Posted by secretbunnyboy
The other thing is that people who don't know or care that their information is false won't "lie" as far as the machine is concerned.

http://www.newyorker.com/reporting/2...fa_fact_talbot -> really excellent article on lie detection through the ages.
From the article:

"Then again we are in a technology-besotted age that rivals the twenties, when Marston popularized lie detection. And we live in a time when there is an understandable hunger for effective ways to expose evildoers, and when concerns about privacy have been nudged aside by our desire for security and certainty. “Brain scans indicate”: what a powerful phrase. One can easily imagine judges being impressed by these pixellated images, which appear so often in scientific journals and in the newspaper. Indeed, if fMRI lie detection is successfully marketed as a service that lawyers steer their clients to, then a refusal even to take such a test could one day be cause for suspicion."

And then there is the issue of "show me the money." For example, if fMRI can be shown to provide substantial cost savings over lengthy investigations and trials, and a lucrative industry can be developed around training and certifying a whole new group of paraprofessionals, then acceptance should become wider and easier.
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Old Aug 16, 2009 | 5:53 am
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Last edited by Bart; Sep 18, 2009 at 6:23 pm
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