Helton William S, Hayrynen Lauren, Schaeffer David
Department of Cognitive and Learning Sciences, Michigan Technological University, Houghton, MI 49931, USA.
Brain Cogn. 2009 Oct;71(1):9-13. doi: 10.1016/j.bandc.2009.03.001. Epub 2009 Mar 28.
Vision researchers have investigated the differences between global and local feature perception. No one has, however, examined the role of global and local feature discrimination in sustained attention tasks. In this experiment participants performed a sustained attention task requiring either global or local letter target discriminations or watched the same displays without any work imperative. Reaction time to targets was slower when global feature discriminations were required than when local feature discriminations were required. Tympanic membrane temperature (TMT) was utilized in this study as an index of cerebral activation. Participants in the global letter detection condition had elevated post-task right TMT, indicative of reduced cerebral activation in the right hemisphere, in comparison to participants in the local letter detection or no-work imperative conditions. Both the performance and physiological results of this study indicate increased cognitive fatigue when global feature discriminations are required.
视觉研究者们已经研究了全局和局部特征感知之间的差异。然而，没有人研究过全局和局部特征辨别在持续注意力任务中的作用。在这个实验中，参与者执行一项持续注意力任务，该任务要求辨别全局或局部字母目标，或者在没有任何工作要求的情况下观看相同的显示内容。与需要辨别局部特征时相比，需要辨别全局特征时对目标的反应时间更慢。在本研究中，鼓膜温度（TMT）被用作大脑激活的指标。与局部字母检测或无工作要求条件下的参与者相比，处于全局字母检测条件下的参与者在任务后右侧TMT升高，这表明右半球大脑激活减少。本研究的行为和生理结果均表明，当需要辨别全局特征时，认知疲劳会增加。
