Elsevier

Neuroscience Letters

Volume 244, Issue 2, 13 March 1998, Pages 73-76
Neuroscience Letters

Induced alpha band power changes in the human EEG and attention

https://doi.org/10.1016/S0304-3940(98)00122-0Get rights and content

Abstract

Induced alpha power (in a lower, intermediate and upper band) which is deprived from evoked electroencephalograph (EEG) activity was analyzed in an oddball task in which a warning signal (WS) preceded a target or non-target. The lower band, reflecting phasic alertness, desynchronizes only in response to the WS and target. The intermediate band, reflecting expectancy, desynchronizes about 1 s before a target or non-target appears. Upper alpha desynchronizes only after a target is presented and, thus, reflects the performance of the task which was to count the targets. Thus, only slower alpha frequencies reflect attentional demands such as alertness and expectancy.

Section snippets

Acknowledgements

This research was supported by the Austrian `Fonds zur Förderung der wissenschaftlichen Forschung', P-11569.

References (15)

There are more references available in the full text version of this article.

Cited by (707)

View all citing articles on Scopus
View full text