GMAT Prep 6 CR
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.
Can you please help me in eliminating ans choice B. OA is D.
i think B is not relevant because we are interested in people who suffered damage.
IMO D. For assumptions questions it is very important to find the conclusion. In the question the conclusion is “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.” The conclusion deals with the people who have suffered a stroke on the left side, so the assumption must have been that some damage on the left side would result in impairment of the linguist centre. Choice D is in line with this.
B is irrelevant as it is talking about the class of people which is no where related to the conclusion of the argument.
