I think there are two routs for the BMI. One's based on EEG output, and presumably input; sorta of a lame helmet or small patch on your head like a bandaid. Direct implants are, of course, a bit cooler. A friend actually working in the field described it to me. Isert two uniform electrodes "doped" with a cocktail of nerotrophic factors in the subject's (animal/human) brain: one in the sensory cortex (input), one in the motor cortex (output). You can theorhetically get 50 distinct units of output from the MC outs. The MC ins would be on a neuroperipheral (the first of these will likely be artificial limbs). The SC outs would be on same, with the ins stimulated by a very mild electrical current.
You'd have to learn to control it, using lots of visual input and T&E, but after awhile it'sd be second nature, sort of like operating the mouse.
The dirty tech's already there. All those poor mice with electrodes on their pleasure centres cumming themselves to death, and this guy:
The return of the Robo-roach:
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