Visual evoked potentials (VEPs) are widely used for the analysis and the diagnosis of the brain function on visual system. Since the accuracy of analysis depends on the quality of VEP record, the medical doctors and/or medical technologists always pay attention to the state of recording. In this study, the real-time evaluation system for VEP recording was newly developed. The system displayed the information for the characteristic parameters of VEPs, contaminated artifacts affecting VEP recording and the appearance of background EEG activity in real-time during the recording. Tendency of the VEP characteristics was also comparable with the past VEP records in the data base. Blink artifacts, electromyographic (EMG) artifacts and posterior alpha wave were detected for evaluating the state of subjects. Developed system was applied to VEP recordings of ten healthy adults, then the effectiveness of the proposed system was investigated. Results were revealed that the system achieved the quality of VEP recording with sufficient level and reduced the laborious and time consuming task during the recording. The developed system will be useful as an assistant tool in VEP recordings.
