The psychological stress of telling a lie produces certain : GMAT Critical Reasoning (CR)
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# The psychological stress of telling a lie produces certain

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Manager
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The psychological stress of telling a lie produces certain [#permalink]

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15 Nov 2004, 16:46
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The psychological stress of telling a lie produces certain physiological changes. By using appropriate instruments, the physiological symptoms of lying can be measured and result in reliable lie detection.

Which of the following, if true, most weakens the above argument?

1. Lie detectors are sensitive machines that require constant maintenance

2. Lying is only moderately stress-inducing to some people

3. Lie detector operators must be highly trained and careful

4. Numerous kinds of psychological stress produce similar physiological symptoms

5. Measurement instruments such as lie detectors can be misused and abused.

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15 Nov 2004, 18:36
I think the answer is 4.

Conclusion: Physiological symptoms of lying can be used in reliable lie detection

Premise: Psychological stress of telling a lie produces certain physiological changes

=> The assumption here is that only lying produces the physiological symptoms. This assumption can be weakened if there exist other conditions that produce the same physiological symptom as lying. Which is exactly what statement 4 is saying.
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15 Nov 2004, 18:41
4) Lie detector cannot differentiate among the causes of a symptom. Same symptom could be caused by a psychological stress that originated from a reason other than telling a lie.
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15 Nov 2004, 18:44
I'll vote for 4.
Numerous kinds of psychological stress produce similar physiological symptoms

For example, it is quite possible that because of fear or anxiety, similar physiological symptoms are produced which result in positive for a lie detection test. This would result in an incorrect result in the lie detection machine.
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16 Nov 2004, 11:43
Thanks guys. Yep the answer is D or 4. This is a LSAT type question, folks.

Ta very much!
16 Nov 2004, 11:43
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