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(20) Comparison of Spatiotemporal Activities in Brain Between Correct And Approximation
¡¡¡¡¡¡Choices on Answering Addition International Symposium on Computational
¡¡¡¡¡¡Intelligence and Intelligent Application, Nov.22-26,Guangzhou,China,pp.203-210,2006-11
¡¡We recorded event-related potentials (ERPs) by electroencephalograms (EEGs) while subjects were performing selections of an answer. The subjects 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 presentation 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 latencies from 150ms to 250ms after presentation of choices (PRC) which is 1000ms after the beginning of EEG measurement. Until 250ms after the PRC, ECDs were localized at the same parts in both type, Correct and Approximation. After 250ms from the PRC, the ERP of the approximation answer had delays from 60 to 100ms for the ERP of the correct answer. In the case of approximation answer only, the ECDs were localized at the right MFG.
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