Abstract
The θ rhythm is an approximately sinusoidal electrical signal that can be recorded from the hippocampus, diencephalon, and neocortex of a large number of mammalian species. It was first investigated systematically in 1954 by Green and Arduini, who reported the presence of regular, high-amplitude slow waves at frequencies of 3–7 Hz in the hippocampus of both the curarized and the freely moving rabbit. In the cu-rarized preparation, the waves appeared following natural sensory stimulation or electrical stimulation of the brain stem reticular formation or other subcortical structures. In the freely moving animal, the waves appeared when the animal was judged to be alert and interested in its surroundings. The electrical activity was most pronounced when the animal was presented with a new phenomenon and tended to disappear with repeated stimuli. They termed this activity “θ rhythm” in accordance with the designation that had previously been established for the components of the human EEG in this frequency range (Walter and Walter, 1953). In view of their observations, it was quite natural for them to associate the θ rhythm with a state of arousal in the animal.
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References
Allison, T., and Van Twyver, H. Sleep in moles, Scalopus aquaticus and Candylura crestata. Experimental Neurology 1970, 27, 564–578.
Artemenko, D. O. Role of hippocampal neurons in theta-wave generation. Nierofiziologiya, 1972, 4, 531–539.
Berger, R. J., and Walker, J. M. A polygraphic study of sleep in the tree shrew (Tupaiaglis). Brain, Behavior and Evolution, 1972, 5, 54–69.
Brown, B. B. Frequency and phase of hippocampal theta activity in the spontaneously behaving cat. Electroencephalography and Clinical Neurophysiology, 1968, 24, 53–62.
Fujita, Y., and Sato, T. Intracellular records from hippocampal pyramidal cells in rabbit during theta rhythm activity. Journal of Neurophysiology, 1964, 27, 1011–1025.
Gogolak, G., Stumpf, C., Petsche, H., and štere, J. The firing pattern of septal neurons and the form of the hippocampal theta wave. Brain Research, 1968, 7, 201–207.
Green, J. D., and Arduini, A. A. Hippocampal electrical activity in arousal. Journal of Neurophysiology, 1954, 17, 533–557.
Green, J. D., Maxwell, D. S., Schindler, W. J., and Stumpf, C. Rabbit EEG “theta” rhythm: Its anatomical source and relation to activity in single neurons. Journal of Neurophysiology, 1960, 23, 403–420.
Harper, R. M. Frequency changes in hippocampal electrical activity during movement and tonic immobility. Physiology and Behavior, 1971, 7, 55–58.
Ibata, Y., Desiraju, T., and Pappas, G. D. Light and microscopic study of the projection of the medial septal nucleus to the hippocampus of the cat. Experimental Neurology, 1971, 33, 103–122.
König, J. F. R., and Klippel, R. A. The rat brain. Huntington, N.Y.: Robert E. Krieger, 1970.
Macador, O., Roig, J. A., Monte, J. M., and Budelli, I. The functional relationship between septal and hippocampal unit activity and hippocampal theta rhythm. Physiology and Behavior, 1970, 5, 1443–1449.
McLennan, H., and Miller, J. J. The hippocampal control of neuronal discharges in the septum of the rat. Journal of Physiology (London), 1974, 237, 607–624.
Morales, F. R., Roig, J. A., Monte, J. M., Macador, O., and Budelli, I. Septal unit activity and hip-pocampal EEG during the sleep-wakefulness cycle of the rat. Physiology and Behavior, 1971, 6, 563–567.
Mosko, S., Lynch, G. S., and Cotman, C. W. The distribution of septal projections to the hippocampus of the rat. Journal of Comparative Neurology, 1973, 152, 163–174.
Raisman, G., Cowan, W. M., and Powell, T. P. S. The extrinsic afferent, commissural and association fibres of the hippocampus. Brain, 1965, 88, 963–996.
Siegel, A., and Tassoni, J. P. Differential efferent projections of the lateral and medial septal nuclei to the hippocampus in the cat. Brain, Behavior and Evolution, 1971, 4, 201–219.
Stumpf, C. Drug action on the electrical activity of the hippocampus. International Review of Neurobiology, 1965, 8, 77–138.
Vanderwolf, C. H. Hippocampal electrical activity and voluntary movement in the rat. Electroencephalography and Clinical Neurophysiology, 1969, 26, 407–418.
Van Twyver, H. Sleep patterns in five rodent species. Physiology and Behavior, 1969, 4, 901–905.
Van Twyver, H., and Allison, T. Sleep in the oppossum Didelphis marsupialis. Electroencephalography and Clinical Encephalography, 1970, 29, 181–189.
Walter, V. J., and Walter, W. G. The central effects of rhythmic sensory stimulation. Electroencephalography and Clinical Neurophysiology, 1953, 1, 57–86.
Winson, J. Interspecies differences in the occurrence of theta. Behavioral Biology, 1972, 7, 479–487.
Winson, J. A compact movable microelectrode assembly for recording from the freely-moving rat. Electroencephalography and Clinical Neurophysiology, 1973, 35, 215–217.
Winson, J. Patterns of hippocampal theta rhythm in the freely-moving rat. Electroencephalography and Clinical Neurophysiology, 1974, 36, 291–301.
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© 1975 Plenum Press, New York
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Winson, J. (1975). The θ Mode of Hippocampal Function. In: Isaacson, R.L., Pribram, K.H. (eds) The Hippocampus. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-2979-4_5
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DOI: https://doi.org/10.1007/978-1-4684-2979-4_5
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