Effects of stimulus probability and task-relevance on event-related potentials.
Effects of stimulus probability and task-relevance on event-related potentials.
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DOI：
10.1111/j.1469-8986.1976.tb03082.x
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发表时间：
1976-07
期刊：
影响因子：
3.7
通讯作者：
W. Roth;J. Ford;J. L. Stephen;B. S. Kopell
中科院分区：
文献类型：
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作者：
W. Roth;J. Ford;J. L. Stephen;B. S. Kopell
刺激传递给12名受试者的序列，包括定期发生的标准音调，随机警告音调，随机而噪声突发。一半的噪音突发之前有警告音（高概率），一半没有（低概率）。有四个运行，每个具有两个噪声突发强度中的一个，并且每个具有警告音和噪声突发，或者两者都与反应时间任务相关，或者两者都与任务无关。事件相关电位（ERP）通过F2、C2、P2和眼导联的信号平均获得。提示音的P3在P中最大，不受任务相关性的影响。CNVs先于所有高概率噪声爆发。这些CNV的振幅为5μV，即使爆发与任务无关。低概率噪声爆发引起较大的P3在所有的线索的任务无关的条件下，但只有在Pz的任务相关的条件。在Cz中，NI的振幅。P2和P3的概率很高。与任务相关的噪声爆发与先前CNV的振幅相关。
Stimuli were delivered to 12 subjects in a sequence that included regularly occurring standard tone pips, random warning tone pips, and random while noise bursts. Half the noise bursts were preceded by warning tones (high probability), and half were not (low probability). There were four runs, each having one of two noise burst intensities, and each having the warning tone and noise bursts either both task-relevant to a reaction time task or both task irrelevant. Event-related potentials (ERPs) were obtained by signal averaging in F2, C2, P2 and eye leads. The P3 to the warning tone was largest in P, and was not affected by task relevance. CNVs preceded all the high probability noise bursts. These CNVs had an amplitude of 5μV even when the bursts were task irrelevant. Low probability noise bursts elicited larger P3s in all leads for the task-irrelevant condition, but only in Pz for the task-relevant conditions. In Cz, the amplitudes of NI. P2, and P3 to the high probability. task-relevant noise bursts correlated with the amplitude of the preceding CNV.