Smith A P, Rusted J M, Eaton-Williams P, Savory M, Leathwood P
Health Psychology Research Unit, School of Psychology, University of Wales College of Cardiff, UK.
Neuropsychobiology. 1990;23(3):160-3. doi: 10.1159/000119444.
Previous research has shown that caffeine increases alertness and improves sustained attention. In contrast to this, consumption of lunch leads to a decline in the ability to maintain attention. The main aim of the present study was to determine whether caffeine removes or reduces the postlunch drop in performance, an issue which is of considerable practical importance and theoretical interest. The results showed that caffeine improved performance on the Bakan vigilance task and removed the post-lunch dip observed in the decaffeinated condition. Similar effects were observed in one of the conditions of a mental rotation task. The lunch X caffeine interaction observed in the Bakan task did not change over the course of the task. In contrast to the performance data, lunch X caffeine interactions were not observed in analyses of cardiovascular function or subjective mood.
先前的研究表明，咖啡因能提高警觉性并改善持续注意力。与此相反，吃午餐会导致注意力维持能力下降。本研究的主要目的是确定咖啡因是否能消除或减轻午餐后表现的下降，这一问题具有相当大的实际重要性和理论研究价值。结果表明，咖啡因改善了在巴坎警觉任务中的表现，并消除了在无咖啡因条件下观察到的午餐后注意力下降。在心理旋转任务的一种条件下也观察到了类似的效果。在巴坎任务中观察到的午餐×咖啡因交互作用在任务过程中没有变化。与表现数据相反，在心血管功能或主观情绪分析中未观察到午餐×咖啡因交互作用。
