编辑一份英文研究论文并进行语法检查。


Title: The Effects of Sleep Deprivation and Caffeine Consumption on Cognitive Performance
Author: John Smith
Abstract: This study investigated the effects of sleep deprivation and caffeine consumption on cognitive performance in healthy young adults. The sample consisted of 50 participants, who were randomly assigned to four experimental conditions: deprived-sleep, non-deprived-sleep, caffeine+deprived-sleep, and caffeine+non-deprived-sleep. Cognitive performance was measured using a computerized Stroop task and a digit symbol substitution task. Results indicated that both sleep deprivation and caffeine consumption had a negative impact on cognitive performance. However, the combined effects of sleep deprivation and caffeine consumption were not additive. Implications for further research and practical applications are discussed.
Title: The Effects of Sleep Deprivation and Caffeine Consumption on Cognitive Performance

Author: John Smith

Abstract: This study investigated the effects of sleep deprivation and caffeine consumption on cognitive performance in healthy young adults. The sample consisted of 50 participants who were randomly assigned to four experimental conditions: deprived sleep, non-deprived sleep, caffeine+deprived sleep, and caffeine+non-deprived sleep. Cognitive performance was measured using a computerized Stroop task and a digit symbol substitution task. Results indicated that both sleep deprivation and caffeine consumption had a negative impact on cognitive performance. However, the combined effects of sleep deprivation and caffeine consumption were not additive. Implications for further research and practical applications are discussed.