Abstract
Network oscillations, at fast frequencies (>80Hz), can occur experimentally in hippocampal and cortical preparations, when chemical synapses are blocked. Such oscillations, even at “ripple” frequencies, are generated by electrical coupling between principal neurons. In this chapter, we review the evidence that this type of coupling exists, and that it is mediated by gap junctions between axons. This is important for understanding the cellular mechanisms of very fast oscillations, which are important in disease (such oscillations can precede seizures and perhaps initiate them) and also in normal function: very fast oscillations contribute to the generation of a variety of slower oscillations that appear important for perceptual binding, motor control, and memory consolidation.
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