Communicate by blinks

Happened to watch Stephen Hawking lecture and it was interesting to note one of the methods he uses to communicate. For those of you who don't know, he is affected by motor neuron disease and cannot move his body parts.

Latest research in assistive technology aims to detect eye blinks of the user, uses the duration of eye blinks and position as a means to communicate. It was totally cool to know such advancement in research. One group from MIT works on such things.