Abstract
Concentration has many factors, such as breadth, direction, and depth; however, the relationship of those factors and EEG has not been clarified. This research tries to reveal the relationship by; not using different kind of tasks to make different EEG characteristics, but also using same kind of tasks with different difficulty levels. The task we used is; a) show a certain size of matrix, b) show a blank matrix, and then c) let the subject write down the matrix numbers he/she remembers. All a), b), c) is shown only for a brief time. In this paper, we show that we can assume that differences in depth of concentration caused by different levels of difficulty in tasks, could change the EEG characteristics, in beta wave and theta wave band. We used OpenBCI to record EEG with disposal electrodes at F_z of International 10-20 system. We have not yet analyzed, or determined that this theta wave change between task state and rest state is Fm θ (Frontal-midline theta rhythm). Nor have we calculated if the change in EEG is whether significant or not. Further analysis is needed.
