EFFECTS OF PROLONGED MENTAL WORK ON FUNCTIONAL BRAIN TOPOGRAPHY
EFFECTS OF PROLONGED MENTAL WORK ON FUNCTIONAL BRAIN TOPOGRAPHY
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DOI：
10.1016/0013-4694(90)90035-i
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发表时间：
1990-10-01
期刊：
影响因子：
--
通讯作者：
JEX, HR
中科院分区：
文献类型：
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作者：
GEVINS, AS;BRESSLER, SL;JEX, HR
对执行困难记忆和精细运动控制任务10-14小时的受试者，测量了电极间事件相关协方差的局部模式。这些模式在受试者平均执行任务7-9小时后，但在表现恶化之前发生了显著的变化。在中线中央前区域和整个左半球，在几分之一秒长的反应准备间隔中，模式强度降低。相比之下，在随后的反应抑制间隔中，所有区域的模式强度都降低了。这一模式在与视觉刺激处理相关的间歇时间内变化最小。这表明，除了众所周知的全球神经电信号强度降低外，功能性神经网络还选择性地受到特定任务间隔内持续脑力工作的影响。
Topographic patterns of event-related covariance between electrodes were measured from subjects performing a difficult memory and fine-motor control task for 10-14 h. Striking changes occurred in the patterns after subjects performed the task for an average of 7-9 h, but before performance deteriorated. Pattern strength was reduced in a fraction-of-a second-long response preparation interval over midline precentral areas and over the entire left hemisphere. By contrast, pattern strength in a succeeding response inhibition interval was reduced over all areas. The pattern changed least in an interventing interval associated with visual-stimulus processing. This suggests that, in addition to the well-known global reduction in neuroelectric signal strength, functional neural networks are selectively affected by sustained mental work in specific fraction-of-a-second task intervals.