To search, Click below search items.


All Published Papers Search Service


A Method for EEG Fluctuation Processing II -Application to Pesticide Difference Analysis in Vegetable Ingestion-


Takashi Ajiro, Koichiro Shimomura, Hirobumi Yamamoto, Kenichi Kamijo


Vol. 10  No. 11  pp. 99-110


Electroencephalogram (EEG) tests are frequently used for studying psychological influences, transforming original voltage fluctuation with the Fast Fourier Transformation (FFT) or directly deciphering it. Especially, in the FFT method, the power (μV) of α and β waves are analyzed using various sub-methods to evaluate the brain relaxing or stress states since the internal mechanisms of the brain are still unclear, but it is known that these waves have characteristics depending on the brain state. In our previous work, we measured and analyzed EEG fluctuations when eating komatsuna, a green leafy vegetable also known as Japanese mustard spinach, which is usually grown with three kinds (types) of fertilizers (organic, chemical, and a combination of the two) at two densities (×1 and ×2). Ten examinees (five pairs) ate komatsuna, and we measured their brain activity using EEG. We applied analysis of variance (ANOVA) and relational voltage graphs (basic and detailed analyses) that use relational values derived from the initial values to format data. We generated formatted data from the EEG data, using a specialized program we developed in previous research. In the present study, using the same method, we also measured and analyzed EEG fluctuations while examinees ate komatsuna grown with six different pesticides (in other words, insect control techniques): no pesticides, with insect bites, three chemical pesticides (diazinon, affirm, and agrothrin) and a blend of these three pesticides. From the results, there were significant differences in the α waves depending on the pesticides used. Furthermore, some interactions between defined factors including the kinds of pesticides showed significant differences. However, there were no significant differences in the β waves. Thus, these results indicate that pesticides may not influence the stress state of the human brain but may influence the relaxing state.


ANOVA, SOC, EEG, vegetable ingestion, pesticide, komatsuna, algorithm, analysis program