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Researchers, investigating the link between daily coffee consumption

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Researchers, investigating the link between daily coffee consumption  [#permalink]

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New post Updated on: 05 Sep 2018, 21:20
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Researchers, investigating the link between daily coffee consumption and learning, claim that subjects who consumed one cup of coffee a day for one week (the equivalent of 50 mg per day) exhibited improvements in declarative memory. Furthermore, the study revealed that such improvements were longer-lasting than those witnessed in a control group served decaffeinated coffee (decaffeinated contains negligible amounts of caffeine). After a week of learning a list of facts, the subjects who consumed one cup of coffee were able to recall these facts with significantly more accuracy.

While daily coffee consumption may aid in the process of forming a greater number of short-term memories, and increase the likelihood that these memories will be stored in long-term memory, the study glosses over an important fact. Many exhibit sensitivities to caffeine, including headaches (both migraine and non-migraine), sleeplessness, heightened anxiety and any number of factors that, when working either alone or in tandem, may actually lead to a decrease in the observed link between caffeine and learning. Nonetheless, despite the fact that the study represents a random sampling—and thus any number of subjects can exhibit any number of reactions to caffeine—if enough subjects continue to display signs of improvements in learning, then this result would not be inconsistent with the study’s findings.

Still, until the researchers either release more details of this study, or subsequent studies are conducted, the extent to which those with caffeine sensitivity influenced the observed link between coffee consumption and memory will not be fully known.

1. Based on information in the passage, if a follow-up study had been conducted in which those with caffeine sensitivities were removed, such a study would most likely

A. be so inconclusive as to require scientists to conduct follow-up studies
B. uncover a connection between improvements in declarative memory and caffeine consumption
C. provide scientists little insight into the extent in which those with caffeine sensitivities affected the original study
D. show a more pronounced relationship between caffeine consumption and an improvement in declarative memory
E. need to determine if those without caffeine sensitivities have similar increases in long-term memory retention as they do in short-term memory retention



2. In describing the range of negative reactions of subjects with caffeine sensitivities, the author implies that

A. such subjects do not experience more than one caffeine-related side effect at the same time
B. that those who suffer migraines usually do not experience insomnia
C. none of these subjects, after consuming 50 mg worth of caffeine, will show improvements in memory
D. the negative effects some subjects experience after drinking caffeine are transient and unlikely to affect their performance on memory-related tests
E. the presence of any such reactions can negate the observed link between caffeine consumption and learning



3. According to the passage, the observed results of the study are not inconsistent with the fact that any number of subjects could exhibit caffeine sensitivities because

A. the findings from the study tend to be tentative and will only gain more credibility if scientists are able to replicate findings
B. even subjects who experience migraines after drinking coffee will exhibit improvements in memory
C. any such subjects would have no longer participated in the study, thereby skewing the results in favor of those without caffeine sensitivities
D. the same effect in improvements in declarative memory would be observed regardless of the number of subjects who displayed sensitivities to caffeine
E. as long as a majority of subjects display improved declarative memory, such improvements will likely negate the adverse effects exhibited by those with caffeine sensitivities



Originally posted by aaba on 03 Feb 2018, 11:39.
Last edited by workout on 05 Sep 2018, 21:20, edited 3 times in total.
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Re: Researchers, investigating the link between daily coffee consumption  [#permalink]

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New post 05 Sep 2018, 18:48
workout - this passage is from magoosh can you please change the TAG.
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Re: Researchers, investigating the link between daily coffee consumption  [#permalink]

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New post 05 Sep 2018, 18:50

Official Explanation for Q1



The passage mentions that even if the study had subjects who displayed caffeine sensitivities and a decrease in learning, the positive learning effects from those without caffeine sensitivities would cancel out the decrease in learning from those with caffeine sensitivities. Therefore, if a follow-up study were conducted, in which those with caffeine sensitivities were removed, an even more pronounced effect in caffeine consumption and learning would be evident. This leads us to (D).

(A) is misleading. It almost sounds as though it is referring to the original study. A follow-up study would be more conclusive, at least from the standpoint of showing how pronounced the effect of caffeine on learning is in those without caffeine sensitivities.

(B) is the opposite. A follow-up study would hope to remove any nebulosity or uncertainty from the first study.

(C), like (A) and (B) does the opposite of the follow-up study proposed in the question: it says it would be unhelpful , when in actuality the follow-up study would make the relationship between caffeine and learning clearer.

(D) The answer.

(E) is tempting because it mentions those without caffeine sensitivities. However, the focus is on the observed effect of caffeine on this group and their ability to learn. Differences in long-term memory and short-term memory is a little too specific. It is the fact that the link between overall memory boost and caffeine consumption will become more pronounced if only those without caffeine sensitivities remain in the study.
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Re: Researchers, investigating the link between daily coffee consumption  [#permalink]

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New post 05 Sep 2018, 18:51

Official Explanation for Q3



The passage mentions that “if enough subjects continued to show improvements…” it would negate any potential negative effects between learning and caffeine in those with caffeine sensitivities. Therefore, the positive link between caffeine and learning, as observed in the study, is not inconsistent with the fact that a few subjects did not exhibit any improvements in learning. The answer is therefore (E).

(A) seems to sum up one of the main ideas of the passage but does not directly answer the question.

(B) is not supported by the passage.

(C) is wrong because the passage says that those with caffeine sensitivities did take part in the study.

(D) goes against the main thrust of the passage, which is if those with caffeine sensitivities showed no positive effect, or indeed a negative effect, then that would affect the results of the study.

(E) The answer.
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Re: Researchers, investigating the link between daily coffee consumption  [#permalink]

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New post 05 Sep 2018, 18:52
1
workout - Question 2 is incomplete. Please correct it with following lines.

In describing the range of negative reactions of subjects with caffeine sensitivities, the author implies that
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Re: Researchers, investigating the link between daily coffee consumption  [#permalink]

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New post 05 Sep 2018, 18:53

Official Explanation for Q2



Answer: (E)

The author states that some participants in the study may not show an increase in learning after caffeine intake. The reason? They can exhibit side effects (headaches, anxiety, etc.) that can affect their performance. Notice the correct answer, (E), also states that these reactions CAN affect performance, not that they definitely do.

(A) is wrong because the passage says that sensitivities in caffeine may happen alone (a headache) or in tandem (a headache and anxiety).

(B) is also wrong because it implies that side effects can’t happen in tandem, or together.

(C) is too extreme. The passage clearly states that learning MIGHT be disrupted in those with caffeine sensitivities.

(D) sounds commonsensical, but is nowhere supported in the passage. In other words, you have to be able to point at a specific part of the passage that says that the negative side effects don’t last a long time and therefore don’t affect learning.
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Re: Researchers, investigating the link between daily coffee consumption  [#permalink]

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New post 05 Sep 2018, 21:21
aragonn wrote:
workout - Question 2 is incomplete. Please correct it with following lines.

In describing the range of negative reactions of subjects with caffeine sensitivities, the author implies that


I've made the suggested changes. Thank you.
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Re: Researchers, investigating the link between daily coffee consumption &nbs [#permalink] 05 Sep 2018, 21:21
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