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SOME OBSERVATIONS ON THE BASIC EEG RHYTHM OF EPILEPTIC PATIENTS IN TERMS OF AUTOCOR‐RELOGRAMS, FREQUENCY SPECTRA AND FREQUENCY RESPONSES
Author(s) -
Mochizuki Junji
Publication year - 1966
Publication title -
psychiatry and clinical neurosciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.609
H-Index - 74
eISSN - 1440-1819
pISSN - 1323-1316
DOI - 10.1111/j.1440-1819.1966.tb01225.x
Subject(s) - electroencephalography , spectral line , rhythm , frequency spectrum , audiology , oscillation (cell signaling) , frequency analysis , physics , petit mal , occipital region , psychology , nuclear magnetic resonance , medicine , chemistry , neuroscience , anatomy , acoustics , optics , biochemistry , astronomy , spectrum analyzer
S ummary A study was done on autocorrelograms of EEGs obtained numerically by a simplified method (Sato et al. 1962), their frequency spectra and frequency response activities of two petit mal and ten grand mal patients. Autocorrelograms of the EEGs of petit mal patient in the occipital, parietal and temporal regions showed relatively regular oscillation of about 10 cps, not distinctly different from those of normal adults demonstrated by Yuzuriha (1960) and Sata (1963, 1965). The situation, of course, was the same in their frequency spectra. On the contrary, irregular fluctuations were observed in the autocorrelograms of grand mal patients and the predominant peaks were observed in their frequency spectra in the frequency range slower than 10 cps, whereas peaks at about 10 cps were not so dominant. In some instances, peaks also appeared at frequencies higher than 10 cps. Multimodal frequency response activities were induced by rhythmic flash stimulation of 1–20 or ‐30 cps in the petit and grand mal patients. These peaks were not located at the same frequency as the peak in the frequency spectra of the EEG from the same region of the same patient, but, rather, the predominant activity was enhanced in many instances at a frequency lower than that of the dominant peak in the frequency spectrum. It was verified in the grand mal patients that slow wave activity was driven in the frequency response in the occipital region and a similar tendency was also shown in the parietal and frontal regions. In addition, fast activity was also driven slightly.