When a danger message reaches our spinal cord, there is a gap - called synapse - where different neurons reunite, trying to send information to a single neuron that aims at the brain.
These ascending neurons have different roles in regards to danger messages. Some will reinforce the memory of pain, other will reinforce existing sensors.
From initial danger sensors, we are transitioning towards danger messengers neurons. The synapse represents a sorting site. The brain has control over it though. In fact, the brain is 60 times more powerful than any drug you can think of to manage pain.
If only we could activate this fantastic feature on demand!