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Alternate half-field stimulation technique for SSVEP-based brain–computer interfaces

Alternate half-field stimulation technique for SSVEP-based brain–computer interfaces

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A technique of half-field alternate visual stimulation, combined with differential EEG signal measurement, is applied to acquire steady-state brain-evoked signals. Taking the difference of two signals, measured with properly placed electrodes, enhances the visual-evoked potential (VEP) and suppresses the noise components. An array of different-flash-frequency light-emitting-diode (LED) pairs forms a multiple-choice table. By fixating at different LED pairs, the user communicates (by the VEP of corresponding frequency) his/her decision about the selection of the table entry.

Inspec keywords: visual evoked potentials; user interfaces; biomedical electrodes; medical signal processing; neuromuscular stimulation; electroencephalography

Other keywords: visual-evoked potential; half-field stimulation technique; steady-state signals; alternate visual stimulation technique; EEG signal measurement; light-emitting-diode; SSVEP-based brain-computer interfaces; brain-evoked signals

Subjects: Electrical activity in neurophysiological processes; Bioelectricity; Biology and medical computing; Aids for the handicapped; Signal processing and detection; Electrodiagnostics and other electrical measurement techniques; User interfaces; Computer assistance for persons with handicaps; Bioelectric signals; Digital signal processing

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