Few video games are more basic
than Pong, but Cornell University researchers built a custom
electroencephalography (EEG) device so they could control the game's on-screen
paddle with their minds. The alpha waves that EEG machines read are faint
electrical signals.
They ran the EEG readings through
an amplification circuit to filter and boost the signals. Spiking alpha waves
produced during relaxation move a player's paddle up, and smaller waves,
indicating concentration, move it down. The size of the waves determines how
much the paddle moves.
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