Gap Junctions and Very Fast Oscillations

In this chapter we shall discuss the evidence for the existence of an interesting sort of electrical synapse: gap junctions between the axons of pyramidal neurons; and we shall discuss the roles such gap junctions play in the generation of very fast oscillations (VFO, > ~80 Hz), including so-called ripples. The functional significance of VFO/ripples themselves will be considered in later chapters. Here we focus on morphology and mechanism.