Quantitative evoked potential correlates of the probability of events.
Quantitative evoked potential correlates of the probability of events.
复制标题
定量诱发电位与事件概率相关。
作者：
P. Tueting;S. Sutton;J. Zubin
从人的头皮记录到的平均诱发电位中的晚期正向成分(P3)，无论是在刺激出现之前被告知刺激的身份，还是在没有被告知S并被指示猜测的情况下，都与先验的刺激概率有定量的关系。在猜测情境中，P3的波幅要大得多，它不仅受实验者确定的事件先验概率的影响，而且还受这些概率与S猜测行为的交互作用的影响。晚期正性成分的幅度与特定事件与特定猜测相关的试验比例呈负相关，即命中和未命中的比例。它越大，猜测的结果就越出人意料。这种关系适用于操纵两个事件的概率的不同方法。
A late positive-going component (P3) of the average evoked potential recorded from human scalp was shown to be quantitatively related to a priori stimulus probability both when the S was told the identity of the stimulus before it was presented and when the S was not told, and was instructed to guess. In the guessing situation, the amplitude of P3 was much larger and was influenced not only by the a priori probability of events determined by the experimenter but also by the interaction of these probabilities with the S's guessing behavior. The amplitude of the late positive component was inversely related to the proportion of trials in which a particular event was associated with a particular guess, i.e., the proportion of hits and misses. It was larger the more unexpected the outcome of the guess. This relationship held for different methods of manipulating the probability of two events.