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Theta rhythm: The brain stem involvement
Neuroscience & Biobehavioral Reviews, 1992This review considers the influence of brain stem transections on hippocampal theta rhythm appearance in the acute transected rat and cat. The pretrigeminal transection induces in both species continuous or almost continuous low-frequency theta rhythm while the cortex is desynchronized.
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A circadian rhythm of hippocampal theta activity in the mouse
Physiology & Behavior, 1985Hippocampal theta activity dominates the cortical EEG of the mouse during certain behaviors. We have therefore been able to study the circadian distribution of hippocampal theta activity by means of chronic EEG implantation and computerized EEG state scoring.
D K, Welsh, G S, Richardson, W C, Dement
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Episodic Rage, Theta Rhythm, and Obsessions
Journal of Mental Science, 1953The association of an abnormal electroencephalogram with obsessive-compulsive states has been investigated by Pacellaet al.(1944), who found in these states a higher incidence of “convulsive-type” patterns, consisting of occasional or frequent runs of serial 2–4 c/s potentials of high amplitude than in a random control group.
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Generation of Theta and Gamma Rhythms in the Hippocampus
Neuroscience & Biobehavioral Reviews, 1998In the behaving rat, theta rhythm was dominant during walking and rapid-eye-movement sleep, while irregular slow activity predominated during immobility and slow-wave sleep. Oscillatory evoked potentials of 20-50 Hz and spontaneous fast (gamma) waves were more prominent during theta compared with non-theta behaviors.
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Theta rhythm oscillations and sequence encoding in the hippocampus
Neurocomputing, 2001Abstract Phasic changes in variables including membrane depolarization and synaptic input may set appropriate dynamics for encoding and retrieval during each cycle of the hippocampal theta rhythm. Modeling demonstrates that phasic changes allow activation of an appropriate subset of interconnected neurons, resulting in better encoding of sequences in
Michael E. Hasselmo +2 more
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Neuromodulation, theta rhythm and rat spatial navigation
Neural Networks, 2002Cholinergic and GABAergic innervation of the hippocampus plays an important role in human memory function and rat spatial navigation. Drugs which block acetylcholine receptors or enhance GABA receptor activation cause striking impairments in the encoding of new information.
Michael E. Hasselmo +3 more
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Theta and beta rhythm in the electroencephalograms of normal adults
Electroencephalography and Clinical Neurophysiology, 1951Abstract 1. 1. Low voltage theta activity was detected in 64 per cent of a group of 161 young normal adults and in 24 per cent of 50 mentally normal seniles, the differences between the two groups being significant at the one per cent level. This decrease of theta incidence with increasing age was discussed in relation to maturation processes ...
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Structural hierarchies, theta rhythm, hippocampal function
2004 IEEE International Joint Conference on Neural Networks (IEEE Cat. No.04CH37541), 2005The connection between different structures being at different hierarchical level of the cortico-hippocampal formation and their functional role is discussed. At least three different functions, code generation, mood regulation and navigation is being integrated into a coherent conceptual framework.
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2017
In many brain structures, in particular in the hippocampus, gamma oscillations appear near the crests of much slower, 4–11 Hz oscillations, called theta oscillations or theta rhythms. For an example, see Fig. 34.1.
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In many brain structures, in particular in the hippocampus, gamma oscillations appear near the crests of much slower, 4–11 Hz oscillations, called theta oscillations or theta rhythms. For an example, see Fig. 34.1.
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