[samlynnevans]

That would be a fantastic application, however it would differ slightly in that it would not be a BCI (as in a traditional brain computer interface), but a device within the brain that impeded certain signals being sent to motor neurons that it detected were Parkinsonian. This would involve directly manipulating the output of the brain to the body itself, and require some serious bio-mechanical hardware!

[AstralStorm]

This hardware already exists as an implantable electrode and is used in really hard cases.

It is a competitive inhibitor and additionally stimulates dopamine release.

As for putting something like that in spinal cord or motor centers, very risky surgery. Much more than cranial stimulator one. If this device fails in such a simple way as being jostled, you die.