In contrast to replacement technologies, in 2002, under the heading Project Cyborg, a British scientist, Kevin Warwick , had an array of 100 electrodes fired into his nervous system in order to link his nervous system into the internet to investigate enhancement possibilities. With this in place Warwick successfully carried out a series of experiments including extending his nervous system over the internet to control a robotic hand, also receiving feedback from the fingertips in order to control the hand's grip. This was a form of extended sensory input. Subsequently, he investigated ultrasonic input in order to remotely detect the distance to objects. Finally, with electrodes also implanted into his wife's nervous system, they conducted the first direct electronic communication experiment between the nervous systems of two humans.