Changes of amplitude and topographical characteristics of event-related potentials during the hypnagogic period.
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| Title: | Changes of amplitude and topographical characteristics of event-related potentials during the hypnagogic period. |
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| Authors: | Michida, Nanae (AUTHOR), Ebata, Akiyuki (AUTHOR), Tanaka, Hideki (AUTHOR), Hayashi, Mitsuo (AUTHOR), Hori, Tadao (AUTHOR) |
| Source: | Psychiatry & Clinical Neurosciences. Apr99, Vol. 53 Issue 2, p163-165. 3p. |
| Subjects: | Hypnagogia, Amplitude modulation, Topographic maps |
| 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. [ABSTRACT FROM AUTHOR] |
| Copyright of Psychiatry & Clinical Neurosciences is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Psychology and Behavioral Sciences Collection |
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| 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. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 13231316 |
| DOI: | 10.1046/j.1440-1819.1999.00541.x |
