Tried to upload the video, and after I did, it was immediately removed for copyright issues, even being unlisted, wtf!
Anyway, attached a picture with what's going on:
https://drive.google.com/file/d/0By8lzXoJJdmqSXlRT0tiZ1JWVnM/view?usp=sharingTo translate what's going on there, it's like this:
Sharp pain = neuron X stimulated, then after a short time neuron Y is fired and it inhibits neuron X, pain disappears
Chronic pain = neuron X stimulated, neuron Y is inhibited, neuron X keeps firing => chronic pain that doesn't stop
When you generate some acute pain ("rough" massage) you fire the acute pain pathway, neuron X gets stimulated through that pathway (it was already stimulated through the chronic pathway) but then neuron Y gets stimulated as well, and Y inhibits X. So you can force neuron Y to fire through this acute pain that you're inflicting, in turn making X to be turned off (hopefully).