kkleiner writes: According to Medtronic, the largest manufacturer of deep brain stimulation devices, over 80,000 people around the world have a brain implant. Eighty thousand! Did the age of mental cybernetics arrive while I wasn’t looking? Since 1997, deep brain stimulation (DBS) implants have slowly been gaining US FDA approval for use in patients (2002 for Parkinson’s, 2003 for dystonia). These ‘brain-pacers’ are surgically implanted in the chest but have long lead wires that reach up through the neck and deep into the brain.