Yordanova J, Devrim M, Kolev V, Ademoglu A, Demiralp T
Institute of Physiology, Bulgarian Academy of Sciences, Sofia, Bulgaria.
Neuroreport. 2000 Apr 7;11(5):1097-103. doi: 10.1097/00001756-200004070-00038.
Consecutive and overlapping time-frequency (TF) components of auditory event-related brain potentials (ERPs) were analyzed to examine whether multiple co-existing components may account for the complex functional reactivity of P300. Auditory ERPs of 14 adult subjects were decomposed by means of the wavelet transform (WT), and TF components within P300 were tested in a systematic manner for the effects of major P300 determinants: stimulus probability, active discrimination, and mental count task. The results demonstrated that several partly or fully simultaneous delta, theta, and alpha TF components significantly depend on the factors eliciting P300, and also manifest distinct patterns of task reactivity and scalp distribution. Thus, specific functional processes that underlie the P300 ERP can be distinguished that help to account for its responsiveness to task variables.
分析听觉事件相关脑电位（ERP）的连续和重叠时频（TF）成分，以检验多个共存成分是否可以解释P300复杂的功能反应性。通过小波变换（WT）对14名成年受试者的听觉ERP进行分解，并系统测试P300内的TF成分对主要P300决定因素的影响：刺激概率、主动辨别和心理计数任务。结果表明，几个部分或完全同时出现的δ、θ和α TF成分显著依赖于引发P300的因素，并且还表现出不同的任务反应模式和头皮分布。因此，可以区分出P300 ERP背后的特定功能过程，这有助于解释其对任务变量的反应性。
