Iglesias Alfonso, Martín-Loeches Manuel, Hinojosa José A, Casado Pilar, Muñoz Francisco, Fernández-Frías Carlos
Cognitive Neuroscience Unit. Center for Human Evolution and Behavior, UCM-ISCIII. Sinesio Delgado, 4-6, Pabellón 14, 28029 Madrid, Spain.
Int J Psychophysiol. 2004 Apr;52(2):169-86. doi: 10.1016/j.ijpsycho.2003.06.003.
Recognition potential (RP) is an electrical brain response that has proved its usefulness for studying semantic processing of isolated words, and appears when subjects view meaningful stimuli embedded in a stream of background images at a high rate of presentation: the rapid stream stimulation paradigm (RSS). The present technical study is aimed at testing the validity of this procedure in the study of words within sentences. For this purpose, we varied word and background probability of appearance, the number of background stimuli preceding each word, and stimulus onset asynchrony. Probability did not have significant effects on RP, but it was found that a minimum number of two background stimuli preceding each word and a high rate (250 ms) of presentation are preferable for enhancing RP amplitude. The RSS paradigm would therefore improve the visibility-and, hence, refine the analysis-of a component that can nevertheless be obtained with more standard paradigms, such as rapid serial visual presentation, devoid of interspersed background stimuli.
识别电位（RP）是一种脑电反应，已证明其在研究孤立单词语义加工方面的有效性，当受试者以高呈现速率观看嵌入在一系列背景图像中的有意义刺激时会出现这种电位，即快速流刺激范式（RSS）。本技术研究旨在测试该程序在句子中单词研究中的有效性。为此，我们改变了单词和背景出现的概率、每个单词之前的背景刺激数量以及刺激起始异步性。概率对RP没有显著影响，但发现每个单词之前至少有两个背景刺激以及高呈现速率（250毫秒）更有利于增强RP波幅。因此，RSS范式将提高一种成分的可见性——从而完善对该成分的分析——而这种成分也可以通过更标准的范式获得，如快速序列视觉呈现，只是没有穿插背景刺激。
