I work as an EEG technician, with a background in electronics, and computer programming. This technology is most certainly possible, but in fact a real reality. The results are usually a result of part classical conditioning, and part cognitive neurology. http://en.wikipedia.org/wiki/Brain%E2%80%93computer_interfac...

This is not a huge leap from other devices like cochlear implants. Some of the newer implants use coils to avoid having wires pass through the skull. http://en.wikipedia.org/wiki/Cochlear_implant