[Effect of the time of day on the EEG in XXXX ].

@entity1 @entity2414 @entity25 @entity4522
The study was conducted with three @entity1 and seven @entity1 , 72-84 years old, characterized by psychopathological and clinical signs of @entity4522 (A). All @entity1 suffered from @entity25 . With one exception every experiment ran for five days during which closed-eye-EEGs were registered at 8 a.m., 12 noon, 4 p.m., and 8 p.m. of the alert but relaxed @entity1 and recorded on tape for computer processing. Simultaneously with every EEG registration the body temperature was measured. The findings were compared statistically with corresponding data of a former study conducted with ten healthy aged volunteers (G). RESULTS: The dominant peak-frequency of the @entity1 turned out significantly slower than that of the volunteers.--While in healthy @entity1 the peak frequency increased corresponding with the body temperature from the morning to the late afternoon or the early evening respectively, the @entity1 lacked such a correlation, although their temperatures rose gradually in the normal way. In most of the @entity1 the peak-frequency had a remarkable small variety from day to day as well as from scalp-position, and its circadian shift was poor. Psychopathologically these subjects manifested primarily @entity2414 , general intellectual decline, and in four cases disorientation. On the other hand the EEGs of three @entity1 showed substantial greater variety of the peak-frequency from day to day and from scalp-position to scalp-position. Besides the alterations during the day were rather excessive, but lacking any appreciable correspondence with the undisturbed circadian variations of the body temperature. In these three cases psychopathologically personality changes preponderated.
