Brain scans of people exposed to certain neurotoxins reveal : GMAT Critical Reasoning (CR)
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# Brain scans of people exposed to certain neurotoxins reveal

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Brain scans of people exposed to certain neurotoxins reveal [#permalink]

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05 Apr 2008, 11:37
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Brain scans of people exposed to certain neurotoxins reveal brain damage identical to that found in people suffering from Parkinson’s disease. This fact shows not only that these neurotoxins cause this type of brain damage, but also that the brain damage itself causes Parkinson’s disease. Thus brain scans can be used to determine who is likely to develop Parkinson’s disease.

The argument contains which one of the following reasoning errors?
(A) It fails to establish that other methods that can be used to diagnose Parkinson’s disease are less accurate than brain scans.
(B) It overestimates the importance of early diagnosis in determining appropriate treatments for people suffering from Parkinson’s disease.
(C) It mistakes a correlation between the type of brain damage described and Parkinson’s disease for a causal relation between the two.
(D) It assumes that people would want to know as early as possible whether they were likely to develop Parkinson’s disease.
(E) It neglects to specify how the information provided by brain scans could be used either in treating Parkinson’s disease or in monitoring the progression of the disease.
[Reveal] Spoiler: OA
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05 Apr 2008, 12:11
C

If we substitute "brain damage" for "high body's temperature", we will clearer see the flaw: high body's temperature cause Parkinson’s disease.
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05 Apr 2008, 12:47
with walker, and will go for C
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05 Apr 2008, 13:51
agree with C
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05 Apr 2008, 17:25
OA* is B. Can someone please explain
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05 Apr 2008, 18:31
OA has to be wrong. I searched for this in other forums. Everyone else seems to agree. It's got to be C.
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05 Apr 2008, 20:06
Vavali wrote:
OA* is B. Can someone please explain

May I try?

PREMISES:
Brain scans of people exposed to certain neurotoxins reveal brain damage identical to that found in people suffering from Parkinson’s disease

and
This fact shows not only that ....(do not care what it is following)

CONCLUSION:
Thus brain scans can be used to determine who is likely to develop Parkinson’s disease.

Can you see the difference btw people in the premise and people in the conclusion?

In premise: People are defined by "people exposed to certain neurotoxins". But in conclusion, people are defined by "who is likely to develop Parkinson’s disease = any people"

I can rephrase the argument as follow:

Too general a conclusion is made about "all or any people who is likely to develop Parkinso's disease...." on the basis of a small sample of cases.

From now What do you see B says? Let me know!
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24 May 2010, 13:28
Im also with C.
B talks about treatments and that´s out of scope, dont u think?
Could any CR guru clarify?
Thanks.
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25 May 2010, 10:33
I was searching for this particular CR and it appears to be from CR1000. The OA doesn't seem right. This gives me another reason not to use CR1000, there are some really unreasonable OAs on it.
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27 May 2010, 14:23
dimitri92 wrote:
I was searching for this particular CR and it appears to be from CR1000. The OA doesn't seem right. This gives me another reason not to use CR1000, there are some really unreasonable OAs on it.

So what do you recommend to practice CR?
Thanks.
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27 May 2010, 19:54
IMO C. Is the OA really B
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28 May 2010, 09:55
Vavali wrote:
Brain scans of people exposed to certain neurotoxins reveal brain damage identical to that found in people suffering from Parkinson’s disease. This fact shows not only that these neurotoxins cause this type of brain damage, but also that the brain damage itself causes Parkinson’s disease. Thus brain scans can be used to determine who is likely to develop Parkinson’s disease.

The argument contains which one of the following reasoning errors?
(A) It fails to establish that other methods that can be used to diagnose Parkinson’s disease are less accurate than brain scans.
(B) It overestimates the importance of early diagnosis in determining appropriate treatments for people suffering from Parkinson’s disease.
(C) It mistakes a correlation between the type of brain damage described and Parkinson’s disease for a causal relation between the two.
(D) It assumes that people would want to know as early as possible whether they were likely to develop Parkinson’s disease.
(E) It neglects to specify how the information provided by brain scans could be used either in treating Parkinson’s disease or in monitoring the progression of the disease.

The problem here is causation. The reasoning assumes that the fact that there is an identical brain damage, then the brain damage must be the reason for Parkinson's disease. And concludes that the brain scan could determine who is likely to develop Parkinson's disease.
The problem here is that it confuses a situation with the cause of the disease.
From the options below, only C takes care of this issue.
A. Other methods are not the scope of the passage.
B. 'Early' diagnosis not important here, treatment not important either. The role that the diagnosis plays in the treatment is not even mentioned.
C. Right on the issue.
D. Doesn't talk about what are people's wants.
E. That's not the purpose of the argument.

I think that C is the right answer.
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27 Oct 2010, 20:29
I found this:

For question 9....the author makes a serious mistake my depending on one practice to determine a related practice. We have to take into consideration that brain damage also causes Parkinson disease and the neurotoxins also contribute. Brain damage would be a result of other than the neurotoxins. Hence the scanning of brains to people who are EXPOSED to neurotoxins is just one way to get Parkinson and not the only way. He overestimates it.

Regards
Carsen

And I think the OA* B is correct!

C is incorrect because It doesn't necessarily a mistake of a correlation, it just not sure yet.
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27 Oct 2010, 21:10
+1 C
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29 Oct 2010, 20:51
+1 c
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07 Dec 2010, 18:58
There is a known issue with this answer key in LSAC documents. It transposes this question with the question next to it. The correct answer for this question is C.
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07 Dec 2010, 22:30
+1 C
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Re: Brain scans of people exposed to certain neurotoxins reveal [#permalink]

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16 Oct 2016, 00:01
lex1987 wrote:
There is a known issue with this answer key in LSAC documents. It transposes this question with the question next to it. The correct answer for this question is C.

no wonder I got these two questions wrong
are there any OA error is the LSAT CR cuz I found myself full of errors
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Re: Brain scans of people exposed to certain neurotoxins reveal   [#permalink] 16 Oct 2016, 00:01
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