From Jim Skeels, Toronto, Ontario, Canada
Chelsea Whyte reports people collaborating to play the game Tetris via electroencephalography (EEG) caps to record brain signals and a transcranial magnetic stimulation cap to transmit them (13 October, p 5). These seem rather cumbersome.
Why not try receivers closer to the brain? People wear dentures right against the roof of the mouth. One day, miniaturisation and signal transmission advances in sensors could make it possible to use a tooth implant.
