抄録
Evoked potentials of EEG means sansation, recognition and action of human. Generally, somatosensory evoked potentials are analysises using averaging or frequency analysis. However, averaging analysis is defective in that high-frequency off-phased components tend to cancel each other and so detailed information may easily be lost. On the other hand, in the frequency analysis, time-axis information may easily be lost. In addition, in the past analysis of data, the amount of the fluctuation represented by the 1/f power spectrum has been treated in its entirety as noise. Nevertheless, non-linear phenomena as represented by chaos of fractal indicate the possibility of quantification in numerical analysis.
In this paper, the fractal analysis of event related potential is carried out, and its results are used to examine fluctuational conditions in intellectual activity. In addition, peaks equivalent to N100 or P300 did not show up clearly. This is considered to be because fractal analysis is more suited to the detection of variations in inducement amount rather than that of peaks.
