Abstract
It is not clear what kind of features the fractal analysis of electroencephalography (EEG) signals reveals. This study aims to understand the feature of fractal structure in detail by analyzing EEGs carefully from the viewpoint of fractal. We divided EEGs into each frequency band and investigated which element is the basis of fractal structure. As a result, we have found that gamma waves play an important role in forming the fractal structure. Moreover, it became possible to distinguish time intervals where the fractal structure can be generated only by gamma waves from other time intervals. An EEG model in which gamma waves are separated from other waves or mixed with other waves can be proposed.
