脳波の相関分析 : Samplingの問題(<特集>脳と神経の研究V)

概要

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A quantitative and objective assessment of the basic rhythms of EEGs was intended and Fourier analysis and correlation analysis were perfomed on EEG-curves selected from the records of three examines. A digital computer, HITAC 103, was used for the numerical calculation of Fourier coefficients and autocorrelation function of the original EEG curves. The data reduction into digitized forms was made manually through photographic magnification (4 times the original). The autocorrelation function of f(t) (expression as a time function of the observed values of the original curve) was calculated from the power spectrum of f(t) on the assumption that f(t) was periodic with a period T, the analysis time. The analysis time and the sampling interval (the interval of two successive sample points of f(t)) was changed, and the resulted difference was studied. Many parts (with or without a common part to each two) were selected for analysis from the original records of 3 examines and seiral variations and factors common between were assessed. Acceptable validity was confirmed of the selection of sampling parameters (sampling interval, ca. 8 msec and analysis times 5 sec to 10 sec) for such analysis. Methodological problems concerned were discussed, particularly those of mathematical models.
千葉大学の論文