During my biomedical engineering undergrad, I messed around with some electroencephalograms. They have a long way to go before the aforementioned capabilities. I’m interested, of course, but I have to admit I’m not too hopeful. The current state of the art is like a single unreliable rotary encoder.

Maybe something realistic will be along the lines of reliable single, dual, or triple controls. Imagine a programmable keyboard with 3 switches. I’m just ideating, and don’t really have much empirical basis, but that intuitively seems like a reasonable outcome. If all I had to do was wear a rechargeable (non-bulky) headband to get an extra 3 key-switches, that would be very useful. (Especially for people or applications without use of hands.)

I have no idea how well (if at all) the communication works in the other direction. This is even more fun to fantasize about.