Abstract: ERPs technique were employed to explore how category use affects the category typicality effect. Inclusion and exclusion judgment were adopted in two experiment groups respectively in order to control the category use goal. The results were, 1)there was no significant difference in Accuracy(ACC)between two groups, while the exclusion group was significantly faster than inclusion group in terms of the Reaction Time(RT). And material property effect was significant in both ACC and RT, nonmember held the highest ACC and the fastest RT with typical exemplars as the second, and atypical exemplars the last. 2)N2 was significantly larger in the inclusion group, while interaction of classification method and material property were marginally significant, indicating that both category use and material property impact the early cognitive processing. 3)N400 waves were related to typicality effects in past studies suggesting that typical item elicit the lowest N400 wave. In the present study, typical items in the inclusion group also elicited the lowest N400 wave, whereas typical items elicited the highest N400 wave in the exclusion group. Thus, typicality effects reversed in the exclusion group. The results suggested that, the operational mechanism of inclusion and exclusion judgments was different, with exclusion judgment easier than inclusion. Category use affected category representation in early cognitive processing period; and the typicality effect was determined by both category use and material property.

Key words: category use goal, typicality effect, N2, N400

摘要： 采用ERPs技术,对不同类别使用目的的典型性效应进行研究。通过分类方式控制类别使用目的,分别采用包含法和排除法对材料进行类属判断。结果表明：（1）排除组反应时显著短于包含组,表明两种条件下被试可能采取了不同的认知加工策略;（2）在认知加工早期阶段210ms-310ms,包含组引发了更大的N2波幅,这说明类别使用目的对类别典型性表征的影响在早期认知加工阶段就已有所表现。（3）370ms-470ms阶段,典型性样例在排除组引发了比包含组更大的N400;表明类别使用目的影响了典型性表征的加工。

关键词: 类别使用目的, 类别典型性, N2, N400