P300 amplitude is determined by target-to-target interval
P300 amplitude is determined by target-to-target interval
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DOI：
10.1017/s0048577201393137
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发表时间：
2002-05-01
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：
Gonsalvez, CJ;Polich, J
P300事件相关脑电位（ERP）测量受目标刺激概率、刺激序列结构中目标之前的非目标数目和刺激间隔（ISI）的影响。这些因素中的每一个都对目标到目标间隔（TTI）有贡献。这也被发现影响P300。本研究采用oddball范式的一种变体，通过改变非靶刺激的数目（0、1、2、3）和ISI（1、2、4 s），系统地研究了TTI对听觉和视觉刺激前P300的影响。先前的非目标的数量一般产生更强的影响比ISI的方式表明，TTI确定P300措施：幅度增加TTI增加的听觉和视觉刺激条件下，而潜伏期往往会随着TTI的增加而减少。TTI是P300反应性的一个关键决定因素，这一发现在资源分配的理论框架内进行了讨论。
P300 event-related brain potential (ERP) measures are affected by target stimulus probability, the number of nontargets preceding the target in the stimulus sequence structure, and interstimulus interval (ISI). Each of these factors contributes to the target-to-target interval (TTI). which also has been found to affect P300. The present study employed a variant of the oddball paradigm and Manipulated the number of preceding nontarget stimuli (0, 1 2, 3) and ISI (1, 2, 4 s) in order to systematically assess TTI effects on P300 values front auditory and visual stimuli. Number of preceding nontargets generally produced stronger effects than ISI in a manner suggesting that TTI determined P300 measures: Amplitude increased as TTI increased for both auditory and visual Stimulus conditions, whereas latency tended to decrease with increased TTI. The finding that TTI is a critical determinant of P300 responsivity is discussed within a resource allocation theoretical framework.