(16) Comparison of the brain activity between correct answer and approximation answer choices on answering
of addition
International symposium on Computational Intelligence and Intelligent Informatics 2005（Tunisia）,
pp.120-123, 2005-10
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 electroencephalogram (EEG) 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 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 1150ms to 1250ms after presentation of choices (PRC). Until 1250ms after the PRC, ECDs were localized to the same parts in both typees, Correct and Approximation. After 1250ms 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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