ADHD儿童的选择性抑制

采用较传统停止信号任务更为精确的选择性停止信号任务,探索ADHD的选择性抑制缺陷的机制。结果发现,ADHD儿童在选择性停止信号任务上,抑制失败的比率明显高于正常儿童,但是其执行加工速度和抑制加工速度与正常儿童没有差异,另外,ADHD儿童表现出了更大的反应变异性。研究认为,ADHD在选择性停止信号任务上的抑制缺陷并非由于抑制加工速度过慢所导致,而是由于其不能很好地维持最佳的激活状态所导致,状态调节理论更能反映ADHD的本质。

The Selective Inhibition of ADHD

The inhibition deficits of ADHD were explored by the nonselective stop signal task in the most previous studies. But it is still not explicit that which causes the inhibition deficit found in stop task, the race between execution and response inhibition or the response variability. The more accurate selective stop signal task was used to explore the deficit of ADHD in this research. It was found that the ADHD group made more commission errors than controls, and they have larger response variability than controls, but there is no difference in the processing speed. We suggest that the disinhibition of ADHD is not caused by the slow cognition tempo rather than by the failure to maintain the optimal arousal state.