Biomaterial Database

[Hippocampus theta rhythms of wakefulness and paradoxical sleep in the rat : a comparative study]. 1980

P Monmaur, and A Karapetsas

In the urethane anaesthetized Rat, hippocampal theta rhythm has been recorded during wakefulness and during paradoxical sleep under the same behavioral and postural conditions. A comparative study of these two rhythms shows the following data: 1) The wakefulness and paradoxical sleep theta rhythms significantly differ from each other in frequency and amplitude. 2) The wakefulness theta rhythm recorded in CA1 region and the paradoxical sleep theta rhythm recorded in dentate gyrus can be selectively eliminated by a septal lesion. In agreement with our previous data the present results are in favor of the existence of two kinds of theta activity having different anatomophysiological bases: one associated with wakefulness and the other with paradoxical sleep. In addition, these results suggest that the two intrahippocampal generators of theta rhythm are functionally independent.

UI	MeSH Term	Description	Entries
D008297	Male		Males
D004569	Electroencephalography	Recording of electric currents developed in the brain by means of electrodes applied to the scalp, to the surface of the brain, or placed within the substance of the brain.	EEG,Electroencephalogram,Electroencephalograms
D006624	Hippocampus	A curved elevation of GRAY MATTER extending the entire length of the floor of the TEMPORAL HORN of the LATERAL VENTRICLE (see also TEMPORAL LOBE). The hippocampus proper, subiculum, and DENTATE GYRUS constitute the hippocampal formation. Sometimes authors include the ENTORHINAL CORTEX in the hippocampal formation.	Ammon Horn,Cornu Ammonis,Hippocampal Formation,Subiculum,Ammon's Horn,Hippocampus Proper,Ammons Horn,Formation, Hippocampal,Formations, Hippocampal,Hippocampal Formations,Hippocampus Propers,Horn, Ammon,Horn, Ammon's,Proper, Hippocampus,Propers, Hippocampus,Subiculums
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D012688	Septum Pellucidum	A triangular double membrane separating the anterior horns of the LATERAL VENTRICLES of the brain. It is situated in the median plane and bounded by the CORPUS CALLOSUM and the body and columns of the FORNIX (BRAIN).	Septum Lucidum,Septum Pelusidum,Supracommissural Septum,Lucidum, Septum,Lucidums, Septum,Pellucidum, Septum,Pelusidum, Septum,Pelusidums, Septum,Septum Lucidums,Septum Pelusidums,Septum, Supracommissural,Septums, Supracommissural,Supracommissural Septums
D012895	Sleep, REM	A stage of sleep characterized by rapid movements of the eye and low voltage fast pattern EEG. It is usually associated with dreaming.	Fast-Wave Sleep,Paradoxical Sleep,Rapid Eye Movements,Rhombencephalic Sleep,Sleep, Fast-Wave,REM Sleep,Eye Movement, Rapid,Eye Movements, Rapid,Fast Wave Sleep,Movement, Rapid Eye,Movements, Rapid Eye,Rapid Eye Movement,Sleep, Fast Wave,Sleep, Paradoxical,Sleep, Rhombencephalic
D013826	Theta Rhythm	Brain waves characterized by a frequency of 4-7 Hz, usually observed in the temporal lobes when the individual is awake, but relaxed and sleepy.	Rhythm, Theta,Rhythms, Theta,Theta Rhythms
D014520	Urethane	Antineoplastic agent that is also used as a veterinary anesthetic. It has also been used as an intermediate in organic synthesis. Urethane is suspected to be a carcinogen.	Ethyl Carbamate,Urethan,Carbamate, Ethyl
D014851	Wakefulness	A state in which there is an enhanced potential for sensitivity and an efficient responsiveness to external stimuli.	Wakefulnesses
D051381	Rats	The common name for the genus Rattus.	Rattus,Rats, Laboratory,Rats, Norway,Rattus norvegicus,Laboratory Rat,Laboratory Rats,Norway Rat,Norway Rats,Rat,Rat, Laboratory,Rat, Norway,norvegicus, Rattus