Design Of Visual Stimulating System For Brain-Computer Interface

Brain-computer Interface technology is the very new channe that connecting the Brain and a Computer or other device (external) and make information communication and control ,it is not normal Brain peripheral nerve and muscle system, Brain-computer interface convert the brain signals directly into external equipment control commands, so information transmission do not need peripheral nerve and muscle etc . The ultimate goal of BCI is to separate the disease patients who loss of movement and let they have ability to use tools such as computer and a speech synthesizer auxiliary tools .This interface can increase patients' ability of independent , so as to improve the quality of their life and alleviate the burden of society.This paper expounds the definition of brain-computer interface and working principle and significance of the research. and explain the working principle of brain-computer interface which based on VEP. so the design of the performance of visual stimuli directly affects BCI work performance. this paper based on the functional requirements of the stimulator , present the overall design scheme of the visual stimuli based on the ARM , including stimulator of the software and hardware design and use of the chip. the PC communicate with main MCU , stimulate the parameters which is needed, receive fuctional code date to the corresponding MCU. produced signal from stimulation of the MCU set signal as the input signal is driven LED to induce effective potentials and convenience of serial communication interface.Finally the paper did some experiment and analyzed the experimental data and verified the visual stimulation and experimental design is reasonable.