The most efficient device to connect your brain to a computer is surprisingly affordable and pretty commonplace: the keyboard.
I see research but not anything I can buy right now.
Actualy, if you receive input data faster than you can process and think, wouldn't that in effect just be a program telling you what to think and do? You could resist, but not be able to independently decide what to do anymore than if a room full of people were shouting at you 24/7.