Abstract
The steady-state visual evoked potential (SSVEP) is used for input signals of brain computer interfaces (BCIs). The SSVEP is generated by flushing visual stimulus. There are two types of stimulus for SSVEP. One is flushing visual stimuli and the other is flipping checkerboard patterns. In comparison with flushing visual stimulus, flipping checkerboard patterns have two advantages. Firstly, flipping checkerboard patterns activate SSVEP with weak energy of light. Secondary, there are little difference of SSVEP's features by each persons.
However, there are few studies described relationship between SSVEP and property of flipping checkerboard patterns. In this study, I pay my attention to the size of the grid in the checkerboard and the length on the side in the checkerboard.
As results, we obtained strongest power of SSVEP when the size of the grid in the checkerboard is 0.14 [cm] and the length on the side in checkerboard is 4.5 [cm]. In these experiments, distance between the checkerboard and subjects' eye is 60 [cm]. From these results, there are suitable size of the grid and length on the side in checkerboard.
