Talk:Afterhyperpolarization

What is the relationship between afterhyperpolarization, the undershoot phase, and the refractory period? It seems to me that people use them different ways, so the exact terminology is a bit confusing.

My impression is that AHP and the undershoot phase are equivalent. The AHP is partially responsible for the refractory period, and the AHP time period occurs within the refractory period. However, some people lump undershoot phase and refractory period together, so I don't know...