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An investigation of phase relations between theta-rhythm potentials in the neocortex and hippocampus of rabbits

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Phase relations between rhythmic activity recorded from the hippocampus and from various levels of the neocortex were calculated on a two-dimensional model on the assumption of the passive spread of hippocampal activity. The calculation showed that if such a spread of activity takes place an appreciable phase shift, caused by the spatio-temporal structure of the hippocampal source of the theta-rhythm, may exist between the rhythmic components of potentials recorded from the neocortex and hippocampus. In some series of electrophysiological experiments on rabbits various consequences of the model calculations were tested. Phase relations of the theta-rhythm recorded in the neocortex and in the hippocampus in the presence of maximal correlation between cortical potentials cannot be explained, in the overwhelming majority of cases, purely by the passive spread of hippocampal activity to the surface of the neocortex.

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Additional information

Institute of Higher Nervous Activity and Neurophysiology, Academy of Sciences of the USSR, Moscow. Translated from Neirofiziologiya, Vol. 6, No. 4, pp. 376–382, July–August, 1974.

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Trush, V.D., Korol'kova, T.A. An investigation of phase relations between theta-rhythm potentials in the neocortex and hippocampus of rabbits. Neurophysiology 6, 296–301 (1974). https://doi.org/10.1007/BF01063481

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  • Phase Shift
  • Model Calculation
  • Phase Relation
  • Overwhelming Majority
  • Rhythmic Activity