中文摘要：

目的 应用事件相关电位（ERP）技术来探讨不同注意条件对数字加工的影响。方法 采用Neuro Scan ERP工作站记录14例在校大学生完成数字比较任务时诱发的EFP。被试者分别在无视觉干扰、集中注意条件下和有视觉干扰、分散注意条件下完成将所听到的数字与“5”进行大小比较的任务。结果（1）在数字比较任务中，分散注意条件下比集中注意条件下的反应时长，t（26）=3．70，P〈0．001。（2）中线部位（FCz，Cz，CPz）数字距离主效应显著（P〈0．001），注意条件主效应显著（P〈0．05），且二者有交互作用（P〈0．05）。集中注意条件下，N1波幅随数字距离的递增而递增，而在分散注意条件下无递次关系。（3）N1潜伏期的数字距离主效应显著（P〈0．05），注意条件主效应不显著，电极位置主效应不显著。中央区及中线部位的N1潜伏期，在集中注意条件下随数字距离的递增而递减，而分散注意条件下无递次关系。结论 不同注意条件对数字加工有不同影响，可发生在认知加工早期。

英文摘要：

Objective To investigate the effects of distractions on number processing using event-related potentials （ERPs）. Methods ERPs were recorded in fourteen undergraduate students while they were asked to compare a heard number with the number ＂5＂ and judge whether its numerical value was larger or smaller than five. This task was carried out under a distracted attention （DA） condition and a focused attention （FA） condition. The reaction time and EEG signals were recorded during the experiment. Results There were significant differences between the reaction times in the different conditions （t26 = 3.70,P 〈 0. 001 ） , with longer times in the DA condition than in the FA condition. The main effects were a numeric distance effect and the attention effect. There were also interactions between the two effects. The amplitude of the component N1 increased with increases in the numeric distance under the FA condition,but this effect did not exist in the DA condition. The main effect of numeric distance on N1 latency was significant （P 〈 0.05 ）. Under the FA condition, the N1 latency decreased as the numeric distance increased. Conclusion Number processing is affected by attention, and the effect occurs in the early stage of information processing.