Caffeine and Sleep: Vocabulary in a Research Abstract
A university health journal publishes this abstract: 'Caffeine use is prevalent among first-year students during examination periods. In a survey of 240 students, 72% reported consuming at least one caffeinated drink after 8 p.m. during the week before final exams. Students who reported late caffeine use also reported shorter sleep duration. However, the relationship was attenuated when students reported exercising regularly; in that group, sleep duration differed by only 12 minutes. The authors caution that the findings are correlational and that self-reported sleep data may be imprecise. They also note that previous studies have produced equivocal results, with some showing no effect. The authors recommend that future research corroborate these findings using objective sleep monitors. The abstract concludes that reducing late caffeine may mitigate sleep problems, but the evidence is not yet strong enough for a campus-wide ban.'
1. In this abstract, what does 'attenuated' most nearly mean? Explain using the surrounding data.
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'Attenuated' means weakened or reduced, not eliminated. The passage says the relationship between late caffeine and shorter sleep was attenuated among students who exercised regularly. The supporting detail is that in that group, sleep duration differed by only 12 minutes. That small difference suggests the link between caffeine and sleep was weaker for exercisers. If 'attenuated' meant 'reversed' or 'proved false,' the passage would not still describe a relationship. The context shows a reduction in strength, so 'weakened' is the best fit.
2. Which word best replaces 'corroborate' in 'future research corroborate these findings'? A) contradict B) confirm C) abandon D) simplify. Explain.
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The best replacement is B, 'confirm.' The authors want future research to use objective sleep monitors, which suggests they want stronger evidence that supports or verifies the current findings. 'Contradict' would mean the opposite, and the authors are not asking future research to oppose them. 'Abandon' and 'simplify' do not fit the idea of testing whether the findings hold. The surrounding phrase 'using objective sleep monitors' points to verification, so 'confirm' is the closest meaning.
3. The authors call previous results 'equivocal.' What does that imply about the evidence, and why does it matter for the recommendation?
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'Equivocal' means ambiguous or mixed, so it implies that previous studies did not all point in the same direction. The passage makes this clear by saying 'with some showing no effect.' This matters because the authors cannot claim a settled conclusion. That is why they recommend only that reducing late caffeine 'may mitigate' sleep problems and why they reject a campus-wide ban for now. If previous results had been consistent, the recommendation could be stronger. The word 'equivocal' therefore signals caution and limits how far the authors are willing to go.