Spencer K M, Polich J
Department of Neuropharmacology, Scripps Research Institute, La Jolla 92037, USA.
Psychophysiology. 1999 Mar;36(2):220-32.
Event-related potentials (ERPs) were elicited with auditory stimuli, and spectral analysis was performed on the poststimulus electroencephalographic (EEG) activity to assess how variables that influence the P300 affect spectral parameters of the resultant ERP. In Experiment 1, a no-stimulus condition was compared with a single repeated tone that was either ignored or counted. In Experiment 2, an auditory oddball paradigm was used in which the subject ignored all stimuli, counted only the target, or counted both the target and the standard stimuli in different conditions. In Experiment 3, stimulus probability was manipulated in separate conditions (.20, .50, .80), with the subject required to count the target stimulus. Delta and theta band spectral power increased whenever P300 amplitude increased. However, as the attentional requirements increased across tasks, alpha-1 and alpha-2 power and mean frequency increased. The findings indicate that auditory stimulus processing modulates the EEG more than just by adding ERP components to the epoch.
通过听觉刺激诱发事件相关电位（ERP），并对刺激后脑电图（EEG）活动进行频谱分析，以评估影响P300的变量如何影响所得ERP的频谱参数。在实验1中，将无刺激条件与被忽略或计数的单个重复音调进行比较。在实验2中，使用了听觉Oddball范式，其中受试者在不同条件下忽略所有刺激、只计数目标刺激或同时计数目标刺激和标准刺激。在实验3中，在不同条件下（0.20、0.50、0.80）操纵刺激概率，要求受试者计数目标刺激。每当P300振幅增加时，δ和θ频段的频谱功率就会增加。然而，随着任务中注意力需求的增加，α1和α2功率以及平均频率也会增加。研究结果表明，听觉刺激处理对脑电图的调制不仅仅是通过在时段中添加ERP成分来实现的。
