Arjona Valladares Antonio, Gómez González Jaime, Gómez Carlos M
Human Psychobiology Lab, Experimental Psychology Department, University of Seville, C/Camilo José Cela s/n, 41018 Sevilla, Spain.
Clinical Management Unit of Mental Health Hospital Virgen Macarena, Avenida Doctor Fedriani, n 3, 41007 Sevilla, Spain.
Neurosci Res. 2017 Feb;115:37-43. doi: 10.1016/j.neures.2016.09.006. Epub 2016 Oct 3.
The present study tries to analyze the neural basis of the so-called "Inter-trial Validity-Invalidity Effects" by means of Event-Related Potentials. The N1, P2, P3a and P3b components were examined. The aim is to show the sequential effects on Event-Related Potentials by analyzing the effect of previous trial condition (n-1) in the processing of current trial target (n). Event-Related Potentials results indicate that the N1 and P2 components show higher negativity in valid trials preceded by invalid trials with respect to valid trials preceded by valid trials, elicited by the so-called "Processing Negativity". Next, the P3a and P3b components show increased positivity in invalid trials preceded by valid trials compared to invalid trials preceded by invalid trials. Present results suggest that there is a dynamic updating of attentional resources and working memory, due to the influence of previous trial condition (n-1) on the current trial processing (n). This dynamic updating would be higher after trial validity changes, and it would be compatible with the Bayesian Brain Model.
本研究试图通过事件相关电位来分析所谓的“试验间有效性-无效性效应”的神经基础。对N1、P2、P3a和P3b成分进行了检测。目的是通过分析前一试次条件（n-1）对当前试次目标（n）加工过程的影响，来展示对事件相关电位的序列效应。事件相关电位结果表明，N1和P2成分在无效试次之后的有效试次中，相对于有效试次之后的有效试次，表现出更高的负性，这是由所谓的“加工负性”引发的。接下来，P3a和P3b成分在有效试次之后的无效试次中，相比于无效试次之后的无效试次，表现出更高的正性。目前的结果表明，由于前一试次条件（n-1）对当前试次加工（n）的影响，存在注意力资源和工作记忆的动态更新。这种动态更新在试次有效性改变后会更高，并且与贝叶斯脑模型相符。
