Brain waves can be used to type alphanumerical characters on a computer screen. This has been demonstrated by Neuroscientists at the Mayo Clinic campus in Jacksonville, Fla and presented at the 2009 annual meeting of the American Epilepsy Society.
In this study, the two patients with epilepsy were already being monitored for seizure activity using electrocorticography (ECoG), in which electrodes are placed directly on the surface of the brain to record electrical activity produced by the firing of nerve cells, sat in front of a monitor that was hooked to a computer running the researchers’ software, which was designed to interpret electrical signals coming from the electrodes. The patients were asked to look at the screen, which contained a 6-by-6 matrix with a single alphanumeric character inside each square. Every time the square with a certain letter flashed, and the patient focused on it, the computer recorded the brain’s response to the flashing letter. The patients were then asked to focus on specific letters, and the computer software recorded the information. The computer then calibrated the system with the individual patient’s specific brain wave, and when the patient then focused on a letter, the letter appeared on the screen.
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Source : Mayo Clinic (web)