The Design Method of SSVEP Stimulus Source based on Overlooking Map

In the field of brain-computer interface, steady-state visual evoked potential (SSVEP) is widely used because of its stability. Although high-intensity stimulus has good accuracy, it can cause severe visual fatigue and even induce epilepsy in subjects. As well as paying attention to its accuracy, personnel should also pay attention to the comfort of the subject. In this paper, combined with the knowledge of spatial psychology, the overlooking map is proposed as the stimulus source to induce the SSVEP signal. 24 subjects participated in the comparison experiment between the overlooking map and the black and white stimuli, and the EEG signal was processed and analyzed online in real time through the CCA algorithm. Afterwards, the two stimuli were scored in terms of personal preference, comfort, and flickering sensation. The experimental results show that the performance of the overlooking map stimulus source is superior to that of the black and white stimulus, and it is more suitable to induce the SSVEP signal of the subjects. As an important aspect of SSVEP-based application and a necessary factor for commercial promotion, user experience provides a good theoretical and experimental research basis for it.