Distractor P3 is associated with attentional capture by stimulus deviance
Distractor P3 is associated with attentional capture by stimulus deviance
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DOI：
10.1016/j.clinph.2008.01.107
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发表时间：
2008-06
影响因子：
4.7
通讯作者：
Risa Sawaki;J. Katayama
中科院分区：
文献类型：
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作者：
Risa Sawaki;J. Katayama
目标 当标准和目标在三刺激奇怪范式中难以区分时，简单的干扰器会引发较大的 P3。本研究调查了干扰 P3 是否反映了刺激偏差引起的注意力捕获或维持标准表征的认知干扰。方法记录了 12 名执行视觉三刺激奇怪范式的参与者的事件相关大脑电位。四种任务条件是由两种干扰刺激呈现类型（中央或双边）和两个标准/目标辨别难度级别（简单或困难）的组合定义的。双侧干扰物有刺激偏差，但不干扰标准表征的维持。结果中央干扰物引发P3，其幅度在困难任务中比在简单任务中更大。相比之下，双侧干扰物在简单任务和困难任务中都会引起较大的 P3。 结论 干扰物 P3 反映了刺激偏差引起的注意力捕获，而不是维持标准表征的认知干扰。 意义 这是第一份报告，表明简单的干扰物可以在简单任务中引起较大的前部分布 P3。目前的研究结果有助于干扰器 P3 评估异常处理的认知功能的临床应用。
OBJECTIVEA simple distractor elicits a large P3 when the standard and target are difficult to discriminate in the three-stimulus oddball paradigm. This study investigated whether the distractor P3 reflects attentional capture by stimulus deviance or cognitive interference with maintaining the standard representation.METHODSEvent-related brain potentials were recorded from 12 participants who performed a visual three-stimulus oddball paradigm. Four task conditions were defined by a combination of two presentation types of distractor stimuli (central or bilateral) and two levels of standard/target discrimination difficulty (easy or difficult). Bilateral distractors had stimulus deviance but did not interfere with maintenance of the standard representation.RESULTSCentral distractors elicited a P3, the amplitude of which was larger in the difficult task than in the easy task. In contrast, bilateral distractors elicited a large P3 in both the easy and difficult tasks.CONCLUSIONSDistractor P3 reflects attentional capture by stimulus deviance, rather than cognitive interference with maintaining the standard representation.SIGNIFICANCEThis is the first report showing that simple distractors can elicit large anteriorly distributed P3 in an easy task. The present findings contribute to the clinical application of distractor P3 to assess the cognitive function of deviant processing.