The stability of error-related brain activity with increasing trials
The stability of error-related brain activity with increasing trials
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DOI：
10.1111/j.1469-8986.2009.00848.x
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发表时间：
2009-09-01
期刊：
影响因子：
3.7
通讯作者：
Hajcak, Greg
中科院分区：
文献类型：
--
作者：
Olvet, Doreen M.;Hajcak, Greg
错误相关负性（ERN）和错误正性（Pe）作为反应监测的神经相关因子，正受到越来越多的研究。总平均数中包含的最小错误试验次数在不同研究中有所不同;事实上，还没有对获得稳定的ERN和Pe所需的试验次数进行系统研究。在目前的研究中，ERN和Pe被量化为两个随机试验被添加到参与者（N=53）的ERP平均值。增加试验增加了与总平均ERN和Pe的相关性;然而，仅用6次试验就获得了高相关性（rs >.80）。ERN和Pe的内部信度分别在6次和2次试验后达到中等水平，ERN和Pe的信噪比分别在8次和4次试验后没有变化。结合起来，这些数据表明，ERN和Pe可以使用至少6至8个错误试验进行量化。
The error-related negativity (ERN) and error positivity (Pe) are increasingly being examined as neural correlates of response monitoring. The minimum number of error trials included in grand averages varies across studies; indeed, there has not been a systematic investigation on the number of trials required to obtain a stable ERN and Pe. In the current study, the ERN and Pe were quantified as two random trials were added to participants' (N=53) ERP averages. Adding trials increased the correlation with the grand average ERN and Pe; however, high correlations (rs >.80) were obtained with only 6 trials. Internal reliability of the ERN and Pe reached moderate levels after 6 and 2 trials and the signal-to-noise ratio of the ERN and Pe did not change after 8 and 4 trials, respectively. Combined, these data suggest that the ERN and Pe can be quantified using a minimum of between 6 and 8 error trials.