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- W1985963846 abstract "Background: Frontal theta rhythms can be observed in routine electroencephalogram (EEG) examinations. Their significance has been interpreted from pathological or physiological viewpoints by many previous studies. We evaluated the clinical electrophysiological significance including aging of the frontal theta rhythms to differentiate pathological theta activities. Methods: Since 23 EEGs, out of 2,424 patients routinely taken in our hospital and 87 healthy volunteers, showed frontal theta rhythms during drowsiness, those subjects were re-examined at rest and during a mental task. The morphological features of theta rhythms were compared between the two conditions and analyzed in terms of clinical conditions. Results: In 16 subjects theta rhythms either disappeared or were suppressed during the mental task (“suppressed” group). In the seven subjects theta rhythms recorded during drowsiness were equivalent or were activated by the mental task (“activated” group). The subjects of the suppressed group were found to have clinical findings suggesting cerebral organic changes, while those of the activated group did not have such findings. In the morphological comparison between these groups, the frequency, amplitude, and duration were significantly different. Conclusion: The differentiation of these two types of frontal theta rhythms may be possible by clinical information, morphological features of theta rhythms and their changes during a mental task. In the case of pathological theta rhythms appearing in middle and advanced age, they can sometimes be based on aging due to arteriosclerotic changes and others." @default.
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- W1985963846 date "2002-12-01" @default.
- W1985963846 modified "2023-09-26" @default.
- W1985963846 title "Frontal Theta Rhythm: Evaluation of its Clinical Electrophysiological Significance with a View Point of Aging" @default.
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- W1985963846 doi "https://doi.org/10.1111/j.1479-8301.2002.tb00040.x" @default.
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