Szucs Dénes, Csépe Valéria
Research Institute for Psychology of the Hungarian Academy of Sciences, Department of Psychophysiology, Group of Developmental Psychophysiology, Szondi utca 83-85, H-1068 Budapest, Hungary.
Brain Res Cogn Brain Res. 2004 Mar;19(1):10-27. doi: 10.1016/j.cogbrainres.2003.11.002.
We investigated whether the mental representation of numbers is abstract amodal or modality-dependent. Subjects verified simple additions. In an event-related potential (ERP) experiment, subjects added an Arabic digit (S2) to a preceding number (S1) offsetting 3 s before S2. S1 was either a visually shown Arabic digit, a written number word or an acoustically presented number word. In a behavioral experiment, we measured the speed of addition using a modified paradigm. In the ERPs to S2, the amplitude of the parietal N1, the fronto-central P2, and the late positivity between 320 and 460 ms were more positive and RTs were faster when S1 was a heard number word than when S1 was a written number word. ERP amplitudes and reaction times took intermediate positions between the other two conditions when S1 was an Arabic digit. Between the Arabic and heard number conditions, this so-called numeral modality effect (NME) was present at electrodes Pz, P4, P3 and Cz when number size was small, whereas it was significant over electrode C4 and P4 when number size was large. Our results suggest that numbers presented in different surface-formats have differential access to number representations. Conclusions for models of number processing are drawn and the possible role of parietal number representations is discussed. We replicated the N270 ERP component and elicited the ERP numerical distance effect in response to incongruent arithmetical results.
我们研究了数字的心理表征是抽象的无模态的还是依赖于模态的。受试者验证简单加法。在一项事件相关电位（ERP）实验中，受试者将一个阿拉伯数字（S2）加到一个在S2之前3秒消失的先前数字（S1）上。S1要么是视觉呈现的阿拉伯数字、书面数字单词，要么是听觉呈现的数字单词。在一项行为实验中，我们使用一种改进的范式测量加法速度。在对S2的ERP中，当S1是听觉呈现的数字单词时，顶叶N1、额中央P2的波幅以及320至460毫秒之间的晚期正波更正向，反应时也比S1是书面数字单词时更快。当S1是阿拉伯数字时，ERP波幅和反应时处于其他两种条件之间的中间位置。在阿拉伯数字和听觉数字条件之间，当数字大小较小时，在电极Pz、P4、P3和Cz处存在这种所谓的数字模态效应（NME），而当数字大小较大时，在电极C4和P4处该效应显著。我们的结果表明，以不同表面形式呈现的数字对数字表征的访问存在差异。得出了数字处理模型的结论，并讨论了顶叶数字表征的可能作用。我们复制了N270 ERP成分，并在对不一致的算术结果的反应中引出了ERP数字距离效应。
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