Multiplicity of the alpha rhythm in normal humans Journal Article
| Authors: | Feshchenko, V. A.; Reinsel, R. A.; Veselis, R. A. |
| Article Title: | Multiplicity of the alpha rhythm in normal humans |
| Abstract: | Previous analyses of the α rhythm in a given single derivation have shown that it is a result of narrowband filtration of a broadband process. As many as three distinct α rhythms within each hemisphere could be differentiated in 65 resting, awake subjects by considering the spatial properties of these rhythms along with their dynamics. The analysis was based on cross-correlation measurements of rhythmic and broadband processes, and comparison of the dynamic characteristics of oscillatory systems underlying the α rhythms. Five-minute epochs of the EEG were recorded to provide 10% precision of the statistical estimates of the variables measured. A frontal α rhythm independent of occipital rhythmic activity was present in 20% of subjects. This third rhythm is distinct from the more familiar α and μ rhythms described in the literature, and is attenuated when the eyes are open. The authors demonstrate that the dynamic characteristics of the oscillatory systems underlying the α rhythm, as well as intrahemispheric coefficients of cross-correlation, are reproducible over time in a single subject. These parameters can form the basis for reliable individual EEG characteristics in the description of the "normal" EEG. The high correlation of the α rhythm in symmetric derivations could be explained by symmetric afferent impulse flows rather than by structural interconnection between the oscillatory systems. |
| Keywords: | adult; accuracy; brain; reference values; frontal lobe; oscillometry; electroencephalogram; normal human; oscillation; correlation function; humans; human; male; female; article; alpha rhythm; α rhythm; cross-correlation; oscillatory system; amplifier; ocular physiology |
| Journal Title: | Journal of Clinical Neurophysiology |
| Volume: | 18 |
| Issue: | 4 |
| ISSN: | 0736-0258 |
| Publisher: | American Clinical Neurophysiology Society |
| Date Published: | 2001-07-01 |
| Start Page: | 331 |
| End Page: | 344 |
| Language: | English |
| PUBMED: | 11673699 |
| PROVIDER: | scopus |
| DOI/URL: | |
| Notes: | Export Date: 21 May 2015 -- Source: Scopus |
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