Stimulus context determines P3a and P3b
Stimulus context determines P3a and P3b
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DOI：
10.1111/1469-8986.3510023
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发表时间：
1998-01-01
期刊：
影响因子：
3.7
通讯作者：
Polich, J
中科院分区：
文献类型：
--
作者：
Katayama, J;Polich, J
P300差异的目标（0.10），非目标（0.10），和标准的音调（0.80）进行了评估，使用三刺激oddball范式，其中参与者只响应于目标（n = 12）。目标/标准（容易或困难）和非目标/标准（大或小）的音高差异进行了正交处理。在所有条件下，目标音引起顶叶P300，这是只受目标/标准歧视缓解。非目标在容易/大和困难/小的条件下，引起了顶叶，但小于目标，但在容易/小的条件下，引起了类似的ERP的标准。然而，在困难/大的条件下，非靶刺激引起的前最大和更早的P300（P3 a）的组成部分。研究结果表明，目标P300不受非目标刺激配置，而非目标P300的结果是直接由刺激的背景。的理论意义进行了讨论。
P300 differences for target (.10), nontarget (.10), and standard tones (.80) were assessed using a three-stimulus oddball paradigm in which participants responded only to the target (n = 12). Target/standard (easy or difficult) and nontarget/standard (large or small) pitch differences were manipulated orthogonally. In all conditions, target tones elicited a parietal P300, which was affected only by the target/standard discrimination ease. Nontarget in the easy/large and difficult/small conditions elicited a parietal but smaller P300 than the target but in the easy/small condition elicited similar ERPs to the standard. However, nontarget stimuli in the difficult/large condition elicited an anterior maximum and earlier P300 (P3a) component. The findings suggest that target P300s are not influenced by the nontarget stimulus configuration, whereas the nontarget P300 outcomes are determined directly by the stimulus context. The theoretical implications are discussed.