Szirtes J, Marton M
Acta Neurobiol Exp (Wars). 1987;47(4):163-71.
The relation between stimulus probability and the late components of the saccade-related brain (lambda) potentials (SRPs) was studied in three kinds of cognitive tasks: guessing, counting and word categorization. These tasks, traditionally used to study event-related potentials, were modified in such a way that subjects had to perform a saccadic eye movement in order to perceive the target stimulus. In guessing and counting tasks three kinds of target stimulus appeared with the probabilities of 17, 33 and 50 percent, respectively. In the semantic word categorization task the stimuli belonged to one of two categories: frequent (80 percent, female names) and infrequent (20 percent, male names). In all three tasks the late positive components (P300 and P4) had greater amplitudes of SRPs elicited by the infrequent stimuli than by the frequent ones. A Principal Component-Varimax Analysis of the SRP data revealed factors corresponding to (1) a positive Slow Wave, (2) the positive P300 and (3) the P4 components, respectively. In addition, the semantic categorization task was correlated with a late (negative) SRP component.
在三种认知任务中研究了刺激概率与扫视相关脑（λ）电位（SRP）晚期成分之间的关系：猜测、计数和单词分类。这些传统上用于研究事件相关电位的任务经过了修改，使得受试者必须进行扫视眼动才能感知目标刺激。在猜测和计数任务中，三种目标刺激分别以17%、33%和50%的概率出现。在语义单词分类任务中，刺激属于两个类别之一：频繁出现的（80%，女性名字）和不频繁出现的（20%，男性名字）。在所有这三项任务中，不频繁刺激引发的SRP晚期正性成分（P300和P4）的幅度大于频繁刺激引发的幅度。对SRP数据进行主成分-方差最大化分析揭示了分别对应于（1）正慢波、（2）正P300和（3）P4成分的因素。此外，语义分类任务与一个晚期（负性）SRP成分相关。
