Stimulus characteristics and task category dissociate the anterior and posterior aspects of the novelty P3
Stimulus characteristics and task category dissociate the anterior and posterior aspects of the novelty P3
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DOI：
10.1111/1469-8986.00022
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发表时间：
2003-03-01
期刊：
影响因子：
3.7
通讯作者：
Hunt, G
中科院分区：
文献类型：
--
作者：
Gaeta, H;Friedman, D;Hunt, G
新奇 P3 是一种与事件相关的潜在成分，最常由“新奇古怪”范例中的环境声音引起。在这种范式的背景下，尚不清楚异常刺激是否可以引发新颖性 P3，无论它们是目标偏差还是非目标偏差，也不清楚刺激的物理特征在多大程度上对新颖性 P3 的幅度有贡献。当前的研究通过在环境声音和音调刺激之间系统地切换目标和非目标偏差来研究这个问题。参与者为 36 名年轻人。听觉刺激是在三种实验条件下呈现的 48 种独特的音调和 48 种独特的环境声音。结果表明，目标和非目标异常会引发新颖的 P3 的前部和后部方面。前部范围的主要决定因素是异常刺激的物理特征与标准之间的差异程度。相比之下，后方面的主要决定因素是异常刺激的任务相关性。
The novelty P3 is an event-related potential component that is most often elicited by environmental sounds within the "novelty oddball" paradigm. Within the context of this paradigm, it is not clear if the novelty P3 can be elicited by deviant stimuli regardless of whether they serve as target or nontarget deviants, or to what extent the physical characteristics of the stimulus contributes to the amplitude of the novelty P3. The current study examines this issue by systematically switching target and nontarget deviants between environmental sounds and tonal stimuli. Participants were 36 young adults. Auditory stimuli were 48 unique tones and 48 unique environmental sounds presented under three experimental conditions. The results showed that target and nontarget deviants elicited novelty P3s with anterior and posterior aspects. The major determinant of the extent of the anterior aspect was the degree of difference between the physical characteristics of the deviant stimuli and the standards. By contrast, the major determinant of the posterior aspect was the task relevance of the deviant stimuli.