Abstract
When electroencephalograms (EEGs) are averaged at eye fixation pauses (at the end of saccades), the specific brain potentials related to the visual information processing can be obtained. This eye‐fixation‐related potential (EFRP) is a type of event‐related potential. In this paper, the authors introduced two systems developed at their laboratory. The first measured the distribution of EFRPs on the scalp with DC amplifiers in order to nullify eye movement artifacts. Three‐dimensional EFRP topographies were obtained. The most prominent component (lambda response) of the waveform appeared at occipital sites. The second system was designed to examine the variation in EFRPs over time, using a sliding average method. The dynamic variation in EFRPs could be observed as an animation. The sequence of variations in amplitude was continuously displayed on a screen. This indicated the process of decrease and recovery of the lambda response generated by changes between periods of brightness and darkness.
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