Functional Peculiarities of Hippocampal Theta-rhythm
نویسنده
چکیده
The phenomenon of disappearance of the theta rhythm after lesioning of the septum and fornix has in its time stimulated a series of reports describing attempts to understand the roles of various structures in determining the electrical activity of the hippocampus and the functional significance of the theta rhythm. In chronic experiments with rabbits have shown that electrical destruction of dorsal amygdalofugal pathways leads to complete and persisted blockade of hippocampal theta rhythm in contrast to ventral one. When studies correlation between theta-rhythmand various forms of behavioral electrostimulation and destruction of dorsal and ventral amygdalofugal ways were carried out. The obtained data testify that frequency stripes of thetarhythm seems reflects a level of activation of the brain structures.
منابع مشابه
What is the function of hippocampal theta rhythm?--Linking behavioral data to phasic properties of field potential and unit recording data.
The extensive physiological data on hippocampal theta rhythm provide an opportunity to evaluate hypotheses about the role of theta rhythm for hippocampal network function. Computational models based on these hypotheses help to link behavioral data with physiological measurements of different variables during theta rhythm. This paper reviews work on network models in which theta rhythm contribut...
متن کاملDifferential effect of procaine injection into the rostral and caudal part of the nucleus pontis oralis on hippocampal theta rhythm in urethane-anesthetized rats.
The nucleus reticularis pontis oralis (RPO) is a reticular structure important for the regulation of paradoxical sleep (PS). However, the data concerning the relation between the RPO and the main tonic indicator of PS, hippocampal theta rhythm, are contradictory: although electrical or cholinergic stimulation of the RPO evoked well-synchronized theta activity, the electrolytic lesion of the str...
متن کاملHippocampal theta rhythm synchronizes visual neurons in sleep and waking.
The hippocampal theta rhythm (theta) was reported to be associated with movements, attention, auditory processing, autonomic functions, learning and memory and postulated as an associator of discontiguous events. Since visual information includes temporal cues, our study was centered on the correlation between hippocampal theta rhythm and lateral geniculate activity. Phase relationships between...
متن کامل[Theta rhythm recorded in the hippocampal formation in vitro].
Theta rhythm is the best synchronized EEG activity that can be recorded in the mammalian brain. Hippocampal formation (HPC) is considered to be the main structure involved in the generation of this activity. Numerous data indicate that theta rhythm is involved in long-term potentiation, spatial learning, spatial navigation, verbal and spatial working memory, REM sleep, locomotor activities, and...
متن کاملMovement-Related Theta Rhythm in Humans: Coordinating Self-Directed Hippocampal Learning
The hippocampus is crucial for episodic or declarative memory and the theta rhythm has been implicated in mnemonic processing, but the functional contribution of theta to memory remains the subject of intense speculation. Recent evidence suggests that the hippocampus might function as a network hub for volitional learning. In contrast to human experiments, electrophysiological recordings in the...
متن کامل