Abstract
Publisher Summary This chapter presents the experiments that are designed to investigate: (1) general features of the cortical “iso-hippocampal rhythm” (IHR), (2) the cortical distribution of the IHR, (3) conditions for the appearance of the cortical IHR, and (4) the cortical excitability during the IHR. The chapter uses the term IHR to denote the activity of extra-hippocampal structures which continues at least for 2 sec at frequencies of the θ of 4-7 c/sec and waxes and wanes in synchrony with the θ-waves of the hippocampus. The IHR activity could appear spontaneously, but it is much easier to induce it by the arousal stimulation. The IHRs presented in the chapter are mainly obtained by the electrical stimulation of the brain stem structures. One of the electrographic arousal states is characterized by cortical desynchronization and hippocampal synchronization. It is reported by Yoshii and associates that the cortical desynchronization sometimes contains a well-developed activity at the frequency-band corresponding to the hippocampal θwaves. The cortical activity with IHR is supposed to be moderately aroused and excludes the indifferent impulses coming to the cortex for inducing the correct performance in the conditioned and learned behavior.
Published Version
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