Investigating stimuli graphics' size and resolution performance in Steady State Visual Evoked Potential

This paper investigates brain signal peaks and their relationship to flicker size and resolution using colour red-white (RW) and monochrome black-white (BW) graphics. The raw electroencephalograph (EEG) signals were recorded using Emotiv EPOC headset into Windows based PC running Emotiv Xavier Test Bench software. The flickers oscillating at 10 Hz of different resolutions were displayed over black and white backgrounds using iPad Pro 12.9” tablet. The signals were analysed and their amplitude and noise levels were measured using MATLAB with EEGLAB and ERPLAB plugins. Flickers with white background elicited better signals. Red and white colour combination for flicker checkerboard outperformed the standard black and white design. Decreasing the flickers' size yielded gradual increase in elicited signal peaks.