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Electrical recordings from the surface of the skull have a wide range of rhythmic components. A major task of analysis of this EEG is to determine their source and functional significance. The hippocampal “theta rhythm” has been extensively studied in rats and its rhythmicity has recently been shown to be functionally significant, per se. Here, we use relevant aspects of the hippocampal literature...
It is well established that the occurrence of theta rhythm in the hippocampus is important in a variety of mnemonic tasks. However, in this review it will be argued that theta-rhythmic activity occurs across distributed networks within the diencephalon and neocortex as well as the hippocampus, and functions to temporally coordinate activity in distributed systems within these regions during mnemonic...
Rhythmic multiunit activity, leading the negative peak of concurrently recorded dentate rhythmical slow-wave activity (RSA, theta) by a constant degree over a range of RSA frequencies, was observed in the supramammillary nucleus (SuM) after carbachol infusion (5%, 0.25-0.5 μl) into the nucleus pontis oralis (RPO). As the rhythmic SuM activity survived bilateral transection anterior to SuM, its occurrence...
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