Changes of amplitude and topographical characteristics of event‐related potentials during the hypnagogic period
Nanae Michida, Akiyuki Ebata, Hideki Tanaka, Mitsuo Hayashi, Tadao Hori
Psychiatry and Clinical Neurosciences April 1, 1999 DOI: 10.1046/j.1440-1819.1999.00541.x (opens in new tab)
Study at a glance
AI-extracted from the abstract| Characteristics | Observational study Peer reviewed |
|---|---|
| Key findings | Proposes that N300 and N550, dominant at anterior sites, may reflect K-complex-related information processing, while P400, prominent at posterior and temporal sites, may reflect activities different from K-complex or P300 mechanisms, as amplitudes increased independently with lowered arousal. |
Abstract
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 components (N300, N550) and P400 independently increased their amplitude at the different areas of the scalp as arousal level lowered. The anterior negative components may reflect the information processing related to the K‐complex. The P400 may reflect other activities different from the K‐complex mechanism or P300 attention mechanisms.