Prototype of binocular head-mounted device for steady state visual evoked potential stimuli

In this paper a preliminary design of newly defined head-mounted device for binocular visual stimuli is presented as part of a electroencephalography framework for non-invasive brain computer interface based on steady state visual evoked potentials. Embedded hardware and software of binocular head-mounted device prototype are presented, while obtainable visual stimuli based on binocular full color light emitting diode arrays are explored and compared to features achievable by other technologies for visual stimulation. Beside this, appurtenant control software with scripting support is described that provides setup of different types of amplitude modulation of primary color carriers with additional phase control and compete binocular support. As such, the presented framework can provide exploration of achievable information transfer rates of visual evoked potentials through modulated visual stimuli and influence of binocular rivalry. Finally, some preliminary experimental results in frequency and time domain are shown that are measured as visual response at occipital regions of the human scalp to sine wave modulated primary color carriers.