The purpose of this study is to evaluate the brain activity in electroencephalogram (EEG) under the emotional stimuli using mobile computer. Twenty-four healthy subjects were evaluated for their ...psychosomatic level with Cornell Medical Index (CMI), State-Trait Anxiety Inventory—Japanese version (STAI), and stress check list (SCL) and divided into two groups: low psychological score group (LSG) and high psychological score group (HPG). EEG was measured under emotionally audio-visual tasks (relax, pleasant, and unpleasant) and emotional sentence tasks (pleasant sentence and unpleasant sentence) using audiovisual stimuli in the mobile computer. EEG was analyzed with a discrete Fourier transform (DFT) to obtain power spectra. The results showed that the power spectra in alpha 2 (10–14 Hz) band in temporal area under the unpleasant stimuli were significantly higher than the spectra under the relax stimuli in the mentally unstable group. These events suggest that the emotional stimuli on mobile phone would affect to their brain reaction related to the mental stability.
On natural ground consisting of altered andesite lava and pyroclastic rock of the Neogene period of the Miocene epoch, two-dimensional resistivity method and VLF-EM survey were conducted in addition ...to seismic wave exploration using the refraction method - which is commonly used for. geological surveys in tunnels. Comparisons of the results of these surveys were made along with comparisons of these results with actual geological conditions found through pilot boring. As a result, geological conditions which were noto clear with only the results of seismic wave exploration using the refraction method could be further elucidated by the other two method. It was also confirmed that the differences in geological conditions within the natural ground, such as the physical and mechanical properties of bedrock and subterranean water conditions, were well refracted in the contrast of the resistivity and seismic wave velocity in the natural ground. It was also through that different geological conditions within the natural ground were probably caused by mineral composition variations due to differences in the extent of past alteretions.
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