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Prestimulus EEG alpha phase synchronicity influences N100 amplitude and reaction time
Author(s) -
Haig Albert R.,
Gordon Evian
Publication year - 1998
Publication title -
psychophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.661
H-Index - 156
eISSN - 1469-8986
pISSN - 0048-5772
DOI - 10.1017/s0048577298970512
Subject(s) - synchronicity , n100 , psychology , stimulus (psychology) , audiology , alpha (finance) , electroencephalography , event related potential , developmental psychology , neuroscience , cognitive psychology , psychometrics , medicine , construct validity , psychoanalysis
The influence of the level of prestimulus alpha phase synchronicity on the N100 component and reaction time (RT) was examined, in target auditory oddball data from 25 normal subjects. Alpha phase synchronicity is a new measure consisting (for a given stimulus presentation) of the angular or circular variance of the alpha phase at stimulus onset across the parieto‐occipital sites. The lower the angular variance, the higher the phase synchronicity (the more closely in phase the alpha activity across these sites) and vice versa. Subaveraged event‐related potentials (ERPs) were formed for high and low prestimulus alpha phase synchronicity stimulus presentations. N100 amplitude was significantly greater in the high than the low phase synchronicity subaverages. In addition, RT was significantly reduced in the high prestimulus alpha phase synchronicity cases. Alpha phase synchronicity reflects an aspect of brain state that influences subsequent stimulus processing.