We recorded event-related potentials (ERPs) by electroencephalograms (EEGs) while subjects were performing selections of an answer. The sub-jects were seven normal university students. They were asked to add double figures and select an answer from the two choices. Choices were of two types; Type1 was correct choice including the correct answer, and Type2 was approximation choice without the correct answer. Moreover, we classified the Type2 into the following cases according to presenta-tion types. The cases were Type2A: the answer was smaller than choices, Type2B: the answer was between choices, and Type2C: the answer was bigger than choices. We analyzed by using the equivalent current dipole source localization (ECDL) to compare brain activities in the meantime. ECDs were localized at the left middle frontal gyrus (MFG), the left inferior frontal gyrus (IFG) and the left lateral postcentral gyrus (PstCG) between
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