You spoke of oscillation!
From one of the old guard - some very smart words on that very topic.
BTW: kinda long but worth the effort.
Slide deck:
http://idies.jhu.edu/wp-content/uploads/2016/09/Sejnowski.JHU16.pdf
Spike timing, signaling, and learning:
Waves (circular and otherwise), and sleep spindles - important bits about the transfer from hippocampus to cortex: