The 'BrainNet' project has been described as a "multi-person non-invasive direct brain-to-brain interface for collaborative problem solving".
As reported by CNET, researchers at the University of Washington and Carnegie Mellon University found a way to connect three brains and have the owners of them make collective decisions without speaking.
Using "electroencephalograms" (EEGs) to record electric impulses from two humans, the team then used "transcranial magnetic stimulation" (TMS) to pass any information onto the third.
This allowed three human subjects to combine and solve Tetris problems using just brain-to-brain communication.
Although both of the 'senders' could see the game being played, the 'receiver' couldn't, and the goal was to send a message to the latter to either rotate or not rotate the piece.
The communication worked by the senders staring at one of two LED lights - both flashing at different frequencies, resulting in different signals being sent to the brain.
The results of the test showed that five groups of three subjects managed to successfully perform the task 81 percent of the time.