This, Dr Silver is convinced, is because the activity in the light-sensitive neurons somehow activated a latent nerve pathway that spans both sides of the spinal cord, allowing them to synchronise.

ECONOMIST: Neurology

Experts disagree about how a migraine is triggered, but the trigeminal nerve an important pathway that carries sensory information about the face and its connections to numerous other nerves and the brain appear to be responsible for transmitting the pain.

WSJ: Fresh Target in Hunt for a Migraine Cure