A system for controlling a machine by cortical signals, including: a mechanism acquiring electrophysiological signals originating from a plurality of locations in the cerebral cortex of a human or animal subject; a producing device adapted to input the electrophysical signals and output control signals from the machine in response to predetermined variations in the characteristics of the electrophysiological signals. At least some of the electrophysiological signals are from predetermined cortex regions and not associated with any performed or imagined activity nor with any sensory stimuli visualized by the human or animal subject. A method for controlling a machine by cortical signals can use such a system.

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