"“There is some unknown mechanism that allows these resonance patterns to form, and these circuits start humming together,” he says. “That humming may then foster subsequent long-term plasticity changes in the brain, so real anatomical circuits can form. But the first thing that happens is they start humming together.” ...................resonance patterns to form................... https://news.mit.edu/2014/synchronized-brain-waves-enable-rapid-learning-0612