Update: Some are calling this a fake, which technically wouldn’t be hard to do.
Apart from a press of the home button to initiate Siri, this prototype Siri hack first spotted by IntoMobile is completely thought-controlled. 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. The video above shows the developers initiating a call, but they say they’ve linked approximately twenty-five brain wave patterns to various Siri-controlled functions, and hope to bypass having to physically press the home button with a fully automated solution in the future. IntoMobile breaks down the intricacies: