The old way they used to do DBS implants in France was to use for the pre-implantation mapping this horrific looking 5-electrode array, the "Ben-Gun", that they

The old way they used to do DBS implants in France was to use for the pre-implantation mapping this horrific looking 5-electrode array, the "Ben-Gun", that they'd just jam through the frontal lobe. A lot of surgeons this side of the atlantic viewed it (with horror and disdain) as sort of boring a nice 5 cm wide tunnel through the brain...fortunately being used less often these days.