Experimental evidences for visual evoked potentials with stimuli beyond the conscious perception threshold

The Steady State Visual Evoked Potentials (SSVEP), present in ElectroEncephaloGram (EEG) signal, are currently used as a convenient approach to a Brain-Computer Interface (BCI). However, the stimulus frequencies are bellow the Flicker Fusion Frequency (FFF). In this work, the possibility of producing SSVEP for stimulus frequency beyond the FFF is investigated. From our experimental SSVEP results, it is shown that there are consistent evidences to support the hypothesis of non-conscious perception. Finally, their practical implications to both engineering and psychological issues are duly discussed.