Actually "Extinction Burst" is a common theme when dealing with behavorial extintion.
Here is a pretty good analogy that Ill cut and paste:
"My favorite example is the elevator button. Let's say you ride the same elevator every day. You get in, you push the button for your floor, and you're rewarded by the doors closing and the elevator taking you to your destination. One day you get in and push the button, and nothing happens. Do you immediately say, "Oh, this must not work anymore, I'll just take the stairs to the 11th floor"? Or do you push the button again? And again? And harder? And faster? And in special sequences? That's the extinction burst." Cut and paste from an internet resource.
Enwikipeida has a blurb on "Extinction Burst"
http://en.wikipedia.org/wiki/Extinction_(psychology)
"While extinction, when implemented consistently over time, results in the eventual decrease of the undesired behavior, in the near-term the subject might exhibit what is called an extinction burst. An extinction burst will often occur when the extinction procedure has just begun. This consists of a sudden and temporary increase in the response's frequency, followed by the eventual decline and extinction of the behavior targeted for elimination.
Take, as an example, a pigeon that has been reinforced to peck an electronic button. During its training history, every time the pigeon pecked the button, it will have received a small amount of bird seed as a reinforcer. So, whenever the bird is hungry, it will peck the button to receive food. However, if the button were to be turned off, the hungry pigeon will first try pecking the button just as it has in the past. When no food is forthcoming, the bird will likely try again... and again, and again. After a period of frantic activity, in which their pecking behavior yields no result, the pigeon's pecking will decrease in frequency.
The evolutionary advantage of this extinction burst is clear. In a natural environment, an animal that persists in a learned behavior, despite not resulting in immediate reinforcement, might still have a chance of producing reinforcing consequences if they try again. This animal would be at an advantage over another animal that gives up too easily."
Makes total sense. After reading many members, cured and being cured, it seem alot of had that big push up in AL levels just before the drop off to extinction or being cured. And it would seem that this point is where most people get the most discouraged. Who knows, in humans there may be a few extinction bursts before the end.