EEG-BASED SYSTEM FOR RAPID ON-OFF SWITCHING WITHOUT PRIOR LEARNING

Details are reported of an EEG-based system that permits a person rapi dly and reliably to switch on and off electrical devices without prior learning. The system detects and utilises increases in the amplitude of the alpha component of the EEG spectrum that occur when people clos e their eyes for more than 1 s. In addition to conventional signal-pro cessing elements, the system incorporates a module for suppressing swi tching at the output of the system when predetermined noise threshold levels (such as those due to sources of EMG) are exceeded. This work i ndicates that a majority, perhaps in excess of 90%, of the adult popul ation can demonstrate the control necessary to operate an electrical d evice or appliance using this system. It is indicated that multilevel switching and quasi-continuous control options are feasible with furth er development of the system. This work has implications for the desig n of a system that could be used, for example, to assist the infirm or severely physically disabled to effect greater control over their env ironment.