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原文：

The study aimed to investigate the effects of caffeine consumption on the cognitive performance of university students. A total of 50 participants were recruited for the study, and they were randomly assigned to either the caffeine or placebo group. The caffeine group was given a 200mg caffeine pill, while the placebo group was given a sugar pill. Participants were asked to complete a cognitive test battery before and after consuming the pill. The results showed that the caffeine group had significantly better performance on the cognitive test battery compared to the placebo group. These findings suggest that caffeine consumption can improve cognitive performance in university students.

修改后：

The purpose of this study was to examine whether caffeine intake has an impact on the cognitive performance of university students. A total of 50 participants were recruited and randomly assigned to either the caffeine or placebo group. The caffeine group was given a 200mg caffeine pill, whereas the placebo group was given a sugar pill. All participants completed a cognitive test battery before and after taking the pill. The results indicated that the caffeine group had significantly better cognitive performance than the placebo group. These findings suggest that caffeine consumption may enhance cognitive performance among university students.