少量先前的研究表明一些抗抑郁药可以消极地影响个人的认知行为，损害记忆和减少反应时间。
Dannewitz, a small number of previous studies suggest some antidepressants can negatively affect individuals' cognitive performance, impairing memory and reducing reaction time.
测试内容包括记忆力、反应时间和认知功能的测试，这些测试的结果随后被用来进行比较。
The test covered memory, reaction times and cognitive function, and the results were subsequently compared.
很多实验表明咖啡因对大脑的有着积极的作用，能改善心情，减少反应时间，提升记忆力，提高警觉以及认知功能。
Many controlled trials have examined the effects of caffeine on the brain, demonstrating that caffeine can improve mood, reaction time, memory, vigilance and general cognitive function.
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