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For most people, the left half of the brain controls linguis

This topic has 1 expert reply and 1 member reply

For most people, the left half of the brain controls linguis

Post Thu Sep 28, 2017 3:28 pm
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 person’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 person’s language centers if the person has not suffered damage to either side of the brain.

What's the best approach to determine the answer?

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Post Sat Oct 21, 2017 5:41 pm
This is a really interesting question. I'd love to get an explantion of how can I solve this CR question. Thanks in advance.

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GMAT/MBA Expert

Post Mon Oct 30, 2017 11:04 am
The conclusion: People who have suffered a serious stroke on the left side of the brain without suffering linguistic impairment must have their language centers in the right half.

Evidence: 1) The left (usually) or right half of the brain controls linguistic capabilities.
2) When a language center of the brain is damaged, for example by a stroke, linguistic capabilities are impaired in some way.

Assumption: Having a serious stroke will impair language centers. If this is NOT true, if a person can have a serious stroke without damage being done to language centers in the brain, then the conclusion is not justified. People with language centers on the left half could then have a serious stroke on the left side without suffering any language impairment. Again, the assumption is that strokes invariably damage language centers, as Choice D says.

Choice A need not be assumed. It might be that some parts, or all parts, are damaged and will never recover. This doesn't affect the argument.
Choice B doesn't have to be assumed. Other causes of linguistic impairment are irrelevant.
Choice C makes an irrelevant comparison.
Choice E might be true, might not be true . . . it doesn't matter.

I'm available if you'd like any follow up.

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