Changes of amplitude and topographical characteristics of event‐related potentials during the hypnagogic period
Psychiatry and Clinical Neurosciences April 1, 1999 Nanae Michida, Akiyuki Ebata, Hideki Tanaka et al.
In the previous study, during the vertex sharp wave period (hypnagogic EEG stage 4), negative components (N300, N550) were dominant at Fz and Cz in contrast to the positive component (P400) being prominent at the other areas, Pz, Oz, T5 and T6. There is no agreement regarding P400 properties during the hypnagogic period. In this study, using topographic mapping, we found that two negative...