Brain implants have long been trapped in the realm of science fiction, but a steady trickle of medical trials suggests the tiny devices could play a big part in humanity's future. That experiment was one of several eye-catching trials that have helped spark a huge buzz around the industry. In the decade to 2020, investors poured more than $30 billion into neurotechnology more widely, according to UNESCO. As the implants get covered by cells, they are less able to transmit signals from the brain and they function less well. Musk's telepathy planWhile most players in the field are exclusively concerned with medical uses for neurotechnology, Musk is different.