1) The “waxing and waning”(w-w) was studied on 479 normal healthy subjects and 2, 264 patients with mis-cellaneous neuro-psychiatric disorders. All the subjects were over 16 years of age.
2) The w-w has been considered as the rhythmicity of normal cerebral activity, but this is uncertain. The auth-or attempts to examine it's properties in this report. The characteristics of the w-w represented at least 40μV of it's maximum amplitude, ca. 1-2 sec. of it's duration, and two or three times difference between maximum and minimum amplitude, and the w-w is mo-re clear and typical by biporal than monoporal recording.
3) The w-w can be seen more clearly and typically at the stage of drowsiness or relaxation, and it is more pro-minent in hyperventilation than in bemegride or pentetrazol provocation.
4) There is no specificity of age. The w-w was observed in 11.3% of normalhealthy subjects.
5) The w-w was markedly observed in the subjects with miscellaneous autonomic disturbances, migraine, arter-iosclerosis, neurotic states and brain damage or posttraumatic complaints.But with statistical procedures, es-pecially, it had much more dominance in the subjects with migraine, miscellaneous autonomic disturbances and posttraumatic complaints at the level of X²<0.01.
6) In almost all the cases with posttraumatic complaints, the w-w may decrease or diminish during continuous observation, but in other cases (ex. neurotics, with miscellaneous autonomic disturbances) it may be contin-uous at all times whether symptoms are remaining or not.
7) There were no significant changes of the w-w produced by any medications.
8) Therefore the w-w is not an abnormal sign, but the “significant sign”, indicating the relationship between the “certain cerebral function” and some clinical conditions.

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