Boksem Maarten A S, Meijman Theo F, Lorist Monicque M
Experimental and Work Psychology, University of Groningen, The Netherlands.
Biol Psychol. 2006 May;72(2):123-32. doi: 10.1016/j.biopsycho.2005.08.007. Epub 2005 Nov 9.
In this study we examined whether the effects of mental fatigue on behaviour are due to reduced action monitoring as indexed by the error related negativity (Ne/ERN), N2 and contingent negative variation (CNV) event-related potential (ERP) components. Therefore, we had subjects perform a task, which required a high degree of action monitoring, continuously for 2h. In addition we tried to relate the observed behavioural and electrophysiological changes to motivational processes and individual differences. Changes in task performance due to fatigue were accompanied by a decrease in Ne/ERN and N2 amplitude, reflecting impaired action monitoring, as well as a decrease in CNV amplitude which reflects reduced response preparation with increasing fatigue. Increasing the motivational level of our subjects resulted in changes in behaviour and brain activity that were different for individual subjects. Subjects that increased their performance accuracy displayed an increase in Ne/ERN amplitude, while subjects that increased their response speed displayed an increase in CNV amplitude. We will discuss the effects prolonged task performance on the behavioural and physiological indices of action monitoring, as well as the relationship between fatigue, motivation and individual differences.
在本研究中，我们探究了心理疲劳对行为的影响是否归因于动作监测的减少，这可通过错误相关负波（Ne/ERN）、N2以及关联性负变（CNV）这些事件相关电位（ERP）成分来衡量。因此，我们让受试者持续执行一项需要高度动作监测的任务，时长为2小时。此外，我们试图将观察到的行为和电生理变化与动机过程及个体差异联系起来。疲劳导致的任务表现变化伴随着Ne/ERN和N2波幅的降低，这反映了动作监测受损，同时CNV波幅也降低，这反映了随着疲劳加剧，反应准备减少。提高受试者的动机水平会导致行为和大脑活动发生变化，而这些变化因个体而异。提高了表现准确性的受试者，其Ne/ERN波幅增加，而提高了反应速度的受试者，其CNV波幅增加。我们将讨论长时间任务执行对动作监测的行为和生理指标的影响，以及疲劳、动机和个体差异之间的关系。
