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(7) Spatiotemporal difference of brain activity between correct and approximation answer
¡¡¡¡choices on addition Information Processing and Management of Uncertainty in
¡¡¡¡Knowledge-Based Systems(IPMU 2006),July 2-7,Paris,France,pp.528-531,2006-7
In the human brain, the logical process is performed in the left hemisphere and the intuitional process is performed in the right hemisphere. We recorded event-related potentials (ERPs) by the electroencephalograms (EEGs) while subjects were performing selections of an answer. The subjects were asked to add double figures and choose an answer from the two choices. Choices were two types; Correct: the correct answer was included in the choices, and Approximation: the correct answer was not included. We analyzed by using the equivalent current dipole source localization (ECDL) to compare the brain activity in the meantime.
ECDs were localized to 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 to 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 to the right MFG.
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