Journal
NEUROSCIENCE AND BIOBEHAVIORAL REVIEWS
Volume 44, Issue -, Pages 94-110Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.neubiorev.2013.05.007
Keywords
Individual alpha peak frequency; Individual alpha bandwidth; Alpha amplitude suppression; Spindle-form segments length; Intra-spindle amplitude variability
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Funding
- Russian Humaniterian Science Foundation [10-06-00265a]
- BIAL [45/08]
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Exploring EEG alpha oscillations has generated considerable interest, in particular with regards to the role they play in cognitive, psychomotor, psycho-emotional and physiological aspects of human life. However, there is no clearly agreed upon definition of what constitutes 'alpha activity' or which of the many indices should be used to characterize it. To address these issues this review attempts to delineate EEG alpha-activity, its physical, molecular and morphological nature, and examine the following indices: (1) the individual alpha peak frequency; (2) activation magnitude, as measured by alpha amplitude suppression across the individual alpha bandwidth in response to eyes opening, and (3) alpha auto-rhythmicity indices: which include intra-spindle amplitude variability, spindle length and steepness. Throughout, the article offers a number of suggestions regarding the mechanism(s) of alpha activity related to inter and intra-individual variability. In addition, it provides some insights into the various psychophysiological indices of alpha activity and highlights their role in optimal functioning and behavior. (C) 2013 Elsevier Ltd. All rights reserved.
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