Quick note . . . :
 

At a recent neurology conference, a discussion was dedicated to optoelectronic interfaces to the brain; was very impression and pausibly not very far from practicle applications. Until recently these interfaces tended to produce quite a lot of heat but shrinking size and lower duties cycle frequencies may lead to practicle human 'implants.'

http://rogers.matse.illinois.edu/

Another speaker at the conference indicated spinal MRI may show inflamation in individuals with ALS . . . .