Cluster headache belongs to a group of primary headache disorders, classified as the trigeminal autonomic cephalalgias or (TACs).

And what they've done here is they've put electrodes in its ganglia and its brain and then a transmitter on top, and it's on a big computer tracking ball.

The nervous system consists of a ventral nerve cord that runs the length of the body, with several ganglia and branches along the way reaching into the extremities of the appendages.