Coherence Training Coherence just means the relationship is stable. It could be in phase (zero phase angle), 180 degrees out of phase (peak lined up with trough or anywhere in between. Coherence speaks to stability of the relationship. Phase speaks to the timing. Synchrony is when the timing relationship between two signals is consistently the same and the firing and recharge periods line up. Generally, we expect to see low coherences in faster brainwaves and higher coherences in slower brainwaves. […]