Bernoulli Institute of Mathematics, Computer Science and Artificial Intelligence, University of Groningen, Nijenborgh 9, 9747 AG Groningen, The Netherlands.
Bernoulli Institute of Mathematics, Computer Science and Artificial Intelligence, University of Groningen, Nijenborgh 9, 9747 AG Groningen, The Netherlands.
Brain Res. 2019 Jul 15;1715:1-12. doi: 10.1016/j.brainres.2019.03.008. Epub 2019 Mar 12.
Several studies have suggested that the centro-parietal positivity (CPP), an EEG potential occurring approximately 500 ms post-stimulus, reflects the accumulation of evidence for making a decision. Yet, most previous studies of the CPP focused exclusively on perceptual decisions with very simple stimuli. In this study, we examined how the dynamics of the CPP depended on the type of decision being made, and whether its slope was related to parameters of an accumulator model of decision making. We show initial evidence that memory- and perceptual decisions about carefully-controlled face stimuli exhibit similar dynamics, but offset by a time difference in decision onset. Importantly, the individual-trial slopes of the CPP are related to the accumulator model's drift parameter. These findings help to further understand the role of the CPP across different kinds of decisions.
已有多项研究表明，中顶正波（CPP）是一种大约在刺激后 500 毫秒出现的脑电信号，它反映了做出决策的证据积累过程。然而，之前大多数关于 CPP 的研究都只关注使用非常简单刺激的感知决策。在本研究中，我们考察了 CPP 的动态如何取决于所做决策的类型，以及其斜率是否与决策的累加模型的参数有关。我们初步证明，对精心控制的面孔刺激的记忆和感知决策表现出相似的动态，但决策起始的时间有差异。重要的是，CPP 的个体试次斜率与累加模型的漂移参数有关。这些发现有助于进一步理解 CPP 在不同类型的决策中的作用。
