Investigatino of the priming effect using event-related brain potentials

本研究采用三个实验考察了启动情境下事件相关脑电位（ERPs）的性质。在Exp. 1和2中，我们使用SOV范式，其中简单的日语句子以主语（S），宾语（O）和动词（V）的顺序视觉呈现，受试者判断其准确性。S是具体名词，V是肯定的（is）或否定的（isn't）。1.在L条件下，REP占25%，在M条件下，REP占50%。DCN诱发N400，REp诱发正波。在两种情况下，REP f所引起的积极性没有差异，这表明积极性并不反映事件的罕见发生，而纯粹是重复的反映。22，检查SOA的效果。在S条件下，从S到O的SOA为200 ms，在M条件下为800 ms，在两种条件下，从S到V的SOA为1600 ms。短SOA时，N400延迟，但对REP阳性无影响。3采用传统的启动范式和词汇判断任务。在C条件下，43%的目标属于“主要”类别。在A条件下，约43%的目标是一个反义词的基本词。在这两种情况下，大约43%的目标是非单词。反应时间的易化和抑制在A条件下比在C条件下更大。虽然N400没有条件效应，但更大的促进作用与早期的积极性相关，这表明N400并不反映在行为测量中观察到的抑制。

Three experiments were conducted to examine the nature of event-related brain protentials (ERPs) in a priming situation. In Exp. 1 and 2, we used the SOV paradigm, where simple Japanese sentences were presented visually in the order of subject (S), object (O), and verb (V), of which the subjects judged the veracity. S was a concrete noun, V was affirmative (is) or negative (isn't).The effect of probability of the REP was examined in Exp. 1. In L coneition, the REP was represented by 25% and in M conditin, 50%. DCN elicited the N400 and REp elicited a positive wave. The positivity elicited by REP fdid not differin either condition, suggesting that the positivity did not reflect the rare occurrence of the event, but waas pure reflection of repetition.In Exp. 22, the effect of SOA was examined. In S condition, the SOA from S to O was 200 ms, and in M condition, 800 ms. In both conditions, SOA from S to V was 1600 ms. Again, DCN elicited the N400 and REP elicited positivity. When the SOA was short, the N400 was delayd, but there was no effects on the REP positivity.Exp. 3 was conducted using a traditional priming paradigm with a lexical decision task. In C condition, 43% of the target fell into the "prime" category. In A condition, about 43% of the target was an antonym of the prime word. In both conditions, about 43% of the target was nonword. facilitation and inhibition in reaction time were greater in the A than in the C condition. Although there was no condition effect on N400, greater facilitation was associated with earlier positivity, suggesting that the N400 did not reflect the inhibition observed in a behavioral measure.