| Flash-related synchronization and desynchronization revealed by a multiple band frequency analysis. | |
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MedLine Citation:
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PMID: 11120922 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The fast Fourier transform (FFT) is a good method to estimate power spectral density (PSD), but the frequency resolution is limited to the sampling window, and thus the precise characteristics of PSD for short signals are not clear. To relax the limitation, a multiple band-pass filter was introduced to estimate the precise course of PSDs for flash visual evoked potentials (VEPs). Signals were recorded during -200 and 600 ms using balanced noncephalic electrodes, and sampled at 1,000 Hz in 12 bits. With 1 Hz and 10 ms resolutions, PSDs were estimated between 10 and 100 Hz. Background powers at the alpha- and beta-bands were high over the posterior scalp, and powers around 200 ms were evoked at the same bands over the same region, corresponding to P110 and N165 of VEPs. Normalized PSDs showed evoked powers around 200 ms and suppressed powers following the evoked powers over the posterior scalp. The evoked powers above the 20 Hz band were not statistically significant, however, the gamma band was significantly evoked intra-individually; details in the gamma bands were varied among the subjects. Details of PSDs were complicated even for a simple task such as watching flashes; both synchronization and desynchronization occurred with different distributions and different time courses. |
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Authors:
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I Shimoyama; Y Kasagi; T Kaiho; T Shibata; Y Nakajima; H Asano |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The Japanese journal of physiology Volume: 50 ISSN: 0021-521X ISO Abbreviation: Jpn. J. Physiol. Publication Date: 2000 Oct |
Date Detail:
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Created Date: 2001-01-26 Completed Date: 2001-03-08 Revised Date: 2007-03-21 |
Medline Journal Info:
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Nlm Unique ID: 2985184R Medline TA: Jpn J Physiol Country: Japan |
Other Details:
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Languages: eng Pagination: 553-9 Citation Subset: IM |
Affiliation:
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Department of Physiology, School of Medicine, Chiba University, Chiba, 260-8670 Japan. ichiro@med.m.chiba-u.ac.jp |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Algorithms* Cortical Synchronization / methods* Evoked Potentials, Visual / physiology* Fourier Analysis Humans Periodicity |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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