TÜBINGEN, GERMANY ¬- We are so surrounded by gadgetry nowadays that it is sometimes hard to tell where devices end and people begin. From computers and scanners to mobile devices, an increasing number of humans spend much of their conscious lives interacting with the world through electronics, the only barrier between brain and machine being the senses - sight, sound, and touch - through which humans and devices interface. But remove those senses from the equation, and electronic devices can become our eyes, ears and even arms and legs, taking in the world around us and interacting with it through software and hardware.