色彩想起時に観察される脳磁図、脳波の計測と電源モデル

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  • Source Models and Measurements of MEG and EEG Activities Associated with Color Imagination
  • シキサイ ソウキジ ニ カンサツサレル ノウ ジズ ノウハ ノ ケイソク ト

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The purpose of this study is to propose a model in which both magnetoencephalogram (MEG) and electroencephalogram (EEG) activities evoked by color imagination are treated simultaneously. The components of magnetic fields perpendicular to the surface of a head were measured by using a dc SQUID with a first-derivative gradiometer. We observed that both MEG and EEG activities were effected by color imagination. The power spectrum of MEG evoked by color imagination showed a single sharp peak at 11Hz. In contrast, the power spectrum of EEG showed two peaks at 9 Hz and 11 Hz. The EEG topography showed that the spectrum component at 11Hz dominated in the occipital region. We proposed a two-dipole model of color imagination using the 14 points of EEG activities. The dipoles were estimated in the visual cortex.

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