For most people, the left half of the brain controls : GMAT Critical Reasoning (CR)
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For most people, the left half of the brain controls

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For most people, the left half of the brain controls [#permalink]

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26 Aug 2006, 19:57
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For most people, the left half of the brain controls linguistic capabilities, but some people have their language centers in the right half. When a language center of the brain is damaged, for example by a stroke, linguistic capabilities are impaired in some way. Therefore, people who have suffered a serious stroke on the left side of the brain without suffering any such impairment must have their language centers in the right half.

Which of the following is an assumption on which the reasoning in the argument above depends?

A. No part of a personâ€™s brain that is damaged by a stroke ever recovers.
B. Impairment of linguistic capabilities does not occur in people who have not suffered any damage to any language center of the brain.
C. Strokes tend to impair linguistic capabilities more severely than does any other cause of damage to language centers in the brain.
D. If there are language centers on the left side of the brain, any serious stroke affecting that side of the brain damages at least one of them.
E. It is impossible to determine which side of the brain contains a personâ€™s language centers if the person has not suffered damage to either side of the brain.
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26 Aug 2006, 21:55
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jerrywu wrote:
For most people, the left half of the brain controls linguistic capabilities, but some people have their language centers in the right half. When a language center of the brain is damaged, for example by a stroke, linguistic capabilities are impaired in some way. Therefore, people who have suffered a serious stroke on the left side of the brain without suffering any such impairment must have their language centers in the right half.

Which of the following is an assumption on which the reasoning in the argument above depends?

A. No part of a personâ€™s brain that is damaged by a stroke ever recovers. ---> Extreme assumption NOPE
B. Impairment of linguistic capabilities does not occur in people who have not suffered any damage to any language center of the brain. ---> Another Extreme assumption NOPE
C. Strokes tend to impair linguistic capabilities more severely than does any other cause of damage to language centers in the brain. ---> Off topic NOPE
D. If there are language centers on the left side of the brain, any serious stroke affecting that side of the brain damages at least one of them. Sounds like a correct assumption. Links the premise to the conclusion.
E. It is impossible to determine which side of the brain contains a personâ€™s language centers if the person has not suffered damage to either side of the brain. Very Extreme. NOPE

My guess is (D)

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26 Aug 2006, 21:59
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Agreed with D
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19 Nov 2013, 03:49
2:58 D seems to be the only only assumption that fits the bill.
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16 May 2014, 05:40
Hi Chiranjeev,

As all the options except D,can be eliminated easily. i just want to test my negation skill here.

The negation of D would be "If there are language centers on the left side of the brain, any serious stroke affecting that
side of the brain damages NONE OF them.

Is it right ?

Thanks

Nitin
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Re: For most people, the left half of the brain controls [#permalink]

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15 Jul 2015, 10:15
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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For most people, the left half of the brain controls [#permalink]

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22 Aug 2015, 18:30
Nitinaka19 wrote:
Hi Chiranjeev,

As all the options except D,can be eliminated easily. i just want to test my negation skill here.

The negation of D would be "If there are language centers on the left side of the brain, any serious stroke affecting that
side of the brain damages NONE OF them.

Is it right ?

Thanks

Nitin

if none is damaged then having a stroke without such impairment and still not having language centers on right side is not possible acc. to question.

One more must be assumption is they cannot have language centers on both sides of the brain.

+1 kudos if this helps.
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14 Sep 2016, 05:17
YES IT does help No other option fits the bill..

crackgmat15 wrote:
Nitinaka19 wrote:
Hi Chiranjeev,

As all the options except D,can be eliminated easily. i just want to test my negation skill here.

The negation of D would be "If there are language centers on the left side of the brain, any serious stroke affecting that
side of the brain damages NONE OF them.

Is it right ?

Thanks

Nitin

if none is damaged then having a stroke without such impairment and still not having language centers on right side is not possible acc. to question.

One more must be assumption is they cannot have language centers on both sides of the brain.

+1 kudos if this helps.
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31 Oct 2016, 22:38
Can anyone please provide a detailed solution for this.
I am kind of totally lost and confused between A B and D
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For most people, the left half of the brain controls [#permalink]

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17 Nov 2016, 17:15
jerrywu wrote:
For most people, the left half of the brain controls linguistic capabilities, but some people have their language centers in the right half. When a language center of the brain is damaged, for example by a stroke, linguistic capabilities are impaired in some way. Therefore, people who have suffered a serious stroke on the left side of the brain without suffering any such impairment must have their language centers in the right half.

Which of the following is an assumption on which the reasoning in the argument above depends?

A. No part of a personâ€™s brain that is damaged by a stroke ever recovers.
B. Impairment of linguistic capabilities does not occur in people who have not suffered any damage to any language center of the brain.
C. Strokes tend to impair linguistic capabilities more severely than does any other cause of damage to language centers in the brain.
D. If there are language centers on the left side of the brain, any serious stroke affecting that side of the brain damages at least one of them.
E. It is impossible to determine which side of the brain contains a personâ€™s language centers if the person has not suffered damage to either side of the brain.

Hi Experts (sayantanc2k , Daagh , e-GMAT , Magoosh)

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17 Nov 2016, 21:42
1988achilles

Conclusion: People who have suffered a serious stroke on the left side of the brain without suffering any such impairment must have their language centers in the right half.

Option B:
Impairment of linguistic capabilities does not occur in people who have not suffered any damage to any language center of the brain.
Negated B:
Impairment of linguistic capabilities does occur in people who have not suffered any damage to any language center of the brain.
This does not affect our argument because it says that people who have NOT suffered any damage to any language center of brain are liable to getting their linguistic capabilities impaired. However, the question doesn't differentiate between people who have suffered any damage to language center and people who haven't. Additionally, this does not come close to explaining that people who have suffered a serious stroke on the left side of the brain without suffering such impairment must have their language centers in the right half!

Option D:
If there are language centers on the left side of the brain, any serious stroke affecting that side of the brain damages at least one of them.
Negated D:
If there are language centers on the left side of the brain, any serious stroke affecting that side of the brain damages NONE of them. So, if it damages NONE in the left side of the brain, you cannot assuredly say that the linguistic capabilities are in the right half of the brain. This breaks the conclusion and is our required assumption.

Hope this helps.
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Re: For most people, the left half of the brain controls [#permalink]

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19 Nov 2016, 17:38
AmritaSarkar89 wrote:
Can anyone please provide a detailed solution for this.
I am kind of totally lost and confused between A B and D

The explanation for B and D is given above by Keats.

The problem with A is the word "no part". If instead it were "the part responsible for linguistic capabilities" then, it could be an assumption.
Negate A:
Some part of a person's brain that is damaged by a stroke recovers.

The part responsible for linguistic capabilities MAY OR MAY NOT be included in this "some part". Hence the argument does not break down by negating option A.
Re: For most people, the left half of the brain controls   [#permalink] 19 Nov 2016, 17:38
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