Effects of task difficulty and invested mental effort on peripheral vasoconstriction
Effects of task difficulty and invested mental effort on peripheral vasoconstriction
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DOI：
10.1111/j.1469-8986.2004.00200.x
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发表时间：
2004-09-01
期刊：
影响因子：
3.7
通讯作者：
Lavie, P
中科院分区：
文献类型：
--
作者：
Iani, C;Gopher, D;Lavie, P
我们进行了两个实验来研究外周动脉张力是否反映了脑力的变化。在休息和认知表现期间，通过新开发的手指体积描记仪记录手指脉搏波振幅、脉冲间隔和中高频波段的脉冲变异性。使用改良版的Sternberg记忆任务，我们有选择地操纵任务的难度（实验1）或受试者对任务的参与程度（实验2）。我们发现休息和任务期间手指脉冲振幅的显著差异，表明该测量反映了由于任务参与而引起的交感神经活动的变化。此外，我们的研究结果表明，当受试者投入努力时，脉冲波幅度降低，这是血管收缩的信号。
We ran two experiments to investigate whether peripheral arterial tone reflects changes in mental effort. Finger pulse wave amplitude, interpulse interval, and pulse variability in the mid- and high-frequency bands were recorded by means of a newly developed finger plethysmograph during both rest and cognitive performance. Using a modified version of the Sternberg memory task, we selectively manipulated either the difficulty of the task (Experiment 1) or the subjects' level of engagement in the task (Experiment 2). We found a significant difference in finger pulse wave amplitude between rest and task periods, suggesting that the measure reflects changes in sympathetic activity due to task engagement. In addition, our results suggest that reduced pulse wave amplitude, signaling vasoconstriction, occurs when subjects are investing effort.