Difference in Areas of the Brain for Fuzzy and Crisp Calculation
Takahiro Yamanoi*, Masaaki Saito*, Michio Sugeno* and EIie Sanchez*
*Division of Electronics and Information Engineering, Faculty of Engineering, Hokkai Gakuen University, west 11-1-1, South 26, Central ward, Sapporo, 064-0926 Japan
**Laboratory for Language-based Intelligent Systems, Brain Science Institute, RIKEN, Hirosawa 2-1, Wako, 351-0198 Japan
***Laboratory of Medical Informatics, Faculty of Medicine, University of Marsei11e II, 27 Bd. Jean Moulin, 13385 Marsei11e Cedex5, France
We recorded event-related potentials (ERPs) by electroencephalography (EEG) during fuzzy and crisp calculation. Questions art divided into 2 types. As type A, questions were presented as sentences. Questions of type B were presented as numerical calculation. In type A, the peak latency of the EEG was around 1100ms. In type B, the peak latency was around 650ms. In type A, from multiple equivalent current dipole source localization (ECDL) around the latency, it followed that sources during fuzzy calculation lie in the right hemisphere and that sources during crisp calculation lie in the left hemisphere. In type B, no significant difference was observed.