So the Senders indicated their decisions by looking at one of two flashing LEDs mounted at the side of the screen, each pulsing at a different frequency. Looking at the first LED signaled “rotate,” while looking at the second signaled “don't rotate.”
As the Senders stared at the LEDs, their brainwaves were beamed out to the headset worn by the Receiver. The transcranial stimulator unit used precise magnetic pulses to stimulate the brain's occipital cortex and generate phantom flashes of light in the Receiver's brain. The Receiver couldn’t see the game, but by concentrating on the input signals from the Senders, the Receiver could determine whether or not to rotate the block.
Essentially, the Senders beamed their thoughts directly into the brain of the Receiver, using none of the standard communication modes we humans have gotten used to over millennia — no gestures, no sounds, no language. Though the system is slow and not 100% consistent, it facilitates direct brain-to-brain communication — or telepathy, if you're feeling dramatic.
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The research team’s work still needs to be peer-reviewed, but a paper about BrainNet that was published on the preprint online repository arXiv notes that it could pave the way toward neural social networks.
“Our results raise the possibility of future brain-to-brain interfaces that enable cooperative problem solving by humans using a 'social network' of connected brains,” the authors write.
“A cloud-based [brain-to-brain interface] server could direct information transmission between any set of devices on the [brain-to-brain interface] network and make it globally operable through the Internet, thereby allowing cloud-based interactions between brains on a global scale,” they add later in the paper. “The pursuit of such [brain-to-brain interfaces] has the potential to not only open new frontiers in human communication and collaboration but also provide us with a deeper understanding of the human brain.”
But none of the technology involved in this is particularly new, actually. The pulsing LED trick has been in use for more than a decade as a way to design eye-tracking software and, more recently, to allow disabled persons to approximate telepathic typing. And depending on how you define your terms, electrical brain stimulation has been around in one form or another since the early 1800s. Remember electroconvulsive therapy? That was a raw take on the theme.
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The BrainNet system builds on the existing technologies by introducing some next-level dynamics concerning group collaboration theory and performance testing. During subsequent rounds of the game, Senders can validate and provide feedback to the Receiver, after they see whether their collaborative partner rotated the Tetris block properly.
“Furthermore,” the research team writes, “by varying the information reliability of the Senders by artificially injecting noise into one Sender's signal, we found that Receivers are able to learn which Sender is more reliable based solely on the information transmitted to their brains.”
Sussing out a Sender’s reliability would only grow more complicated as the network includes a higher number of connected brains. But the promise of this new mode of communication could have a range of different applications, from everyday collaborative projects to medicine, enabling people to combine their mental efforts to work together and solve problems.
It could also make the internet even weirder than it already is.