The guys behind Project Black Mirror have recorded brain wave activity with ECG pads, matched the incoming patterns to pre-saved digital patterns saved on a MacBook, then fed the matched commands to a speech synthesizer chip that translates the command to Siri. This way you can give Siri commands without talking or touching the screen of your iPhone 4S. A full “How they did it” and movie can be found after the break. » Project Black Mirror: Siri Controlled By Brain Waves