Researchers from the University of California in San Diego
have developed a Bluetooth device that allows the wearer to dial a ten-digit number using their thoughts alone. Their experimental device was the subject of a recent study, published in the Journal of Neural Engineering
In their study, volunteers wore special electrode-laden headgear and were shown a screen with the numbers zero through nine, similar to a phone's touch-tone dialing pad. The difference was that each number flashed at a slightly different speed. By concentrating on the number they wished to dial, the device detected the speed of the flashing number by observing the user's brain activity. It's a bit tedious, but the researchers found users could control the system with 70-85% accuracy.