[原著］脳波のコンピューター解析
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Computerized analysis of the EEG has been done since a few years after Berger reported Die Electroenzephalographie. Almost all investigators analyzed it in narrow frequency band such as below 50-60Hz and thought their results would present whole neuronal activity. Keeping the idea that the essentials of EEG are power and frequency spectrum, wedid the following experiment to analyze the EEG up to the upper limmit of frequency. Thirtyseven adult cats were utilized by means of our own EEG analytical system, which is composed of high fidelity.pre- amplifier (MEDELEC AA6MKII , A Vickers Healthcare Company) and signal processor (7T08, NEC-Sanei). Systematic frequency characteristics are less than - 3dB within 20KHz in frequency. The upper limits of frequency in different structures were varied: $6.9 ￥pm 0.8$KHz ($ \pm S. E. M.$ ) in the motor cortex, $4.1 \pm 0.3$KHz in the hippocampus, $2.9 \pm 0.5$KHz in the amygdala, $9.3 \pm 0.6$KHz in the ventrolateral nucleus of the thalamus, $9.9 \pm 0.5$KHz in the midbrain reticular formation and $8.9 \pm 1.3$KHz in the spinal cord. Those of the brain stem structures are higher than the cortical structures. There were three patterns of amplitude spectrum in bi-logarithmic graphs, which were named type f, f+L and L based on the theory of 1/f and Lorentzian fluctuation. The distribution of these patterns in the central nesvous system well corresponds with physio-anatomical system. We discussed, in addition, on the application of other analytical method (cross-correlation) in order to make clear of electric signal transportation in the central nervous system.
- 琉球大学医学部の論文
- 1986-00-00
琉球大学医学部 | 論文
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