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Hitachi have demonstrated a brain-machine interface allowing users to perform simple switching. “In the experiments, test subjects were able to activate the power switch of a model train by performing mental arithmetic and reciting items from memory.” [source: Pink Tentacle]

The technology uses optical topography to map changes in blood flow in the brain to voltage changes in control circuits. [original source: Seihin World] Hitachi plans to have commercial versions available in five years.