Total and relative prestimulus EEG band power contributions to the ERP and behavioural outcomes in an equiprobable auditory Go/NoGo task
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1
University of Wollongong, School of Psychology, Australia
We are interested in mapping the empirically-testable relationships between the brain state immediately prestimulus, and the associated event-related potential (ERP) and behavioural outcomes in the equiprobable auditory Go/NoGo task. Having recently assessed the contributions from 10 levels of prestimulus Cz electroencephalographic (EEG) absolute band amplitude, we now assess these in regard to total power, and the relative power in each traditional EEG band. Participants (N = 24) completed four blocks of an equiprobable auditory Go/NoGo task. For each accepted trial, the spectral composition of the prestimulus (-500 to 0 ms) Cz EEG data was computed via Fast Fourier transform. Go and NoGo trials were separately sorted according to five prestimulus EEG criteria: total power (1-24 Hz), relative delta (1-3 Hz), relative theta (4-7 Hz), relative alpha (8-13 Hz), relative beta (14-24 Hz). For each criterion, the sorted trials were sub-divided into 10 sets from which the average reaction times (RTs) and ERPs were derived, and the ERP component amplitudes were quantified using separate Principal Components Analysis with unrestricted VARIMAX rotation. Seven components were consistently identified: N1-1, Processing Negativity (PN), P2, N2, P3, classic Slow Wave (SW), and Late Positivity (LP). Complex patterns of significant and near significant linear and quadratic effects were found across the different components. Notably, total power modulated the LP, and relative beta power modulated the SW. Behaviourally, relative power in delta and alpha modulated mean RT. Interestingly, relative theta power produced no meaningful effects. Total and relative prestimulus band power appear important in determining the long latency components and Go responding. These results differ considerably from our absolute amplitude findings, suggesting that relative EEG levels offer unique information on the impact of prestimulus EEG on perceptual and cognitive functioning.
Keywords:
Principal Components Analysis (PCA),
sequential processing,
Prestimulus EEG,
EEG-ERP dynamics,
Equiprobable auditory Go/NoGo
Conference:
XII International Conference on Cognitive Neuroscience (ICON-XII), Brisbane, Queensland, Australia, 27 Jul - 31 Jul, 2014.
Presentation Type:
Poster
Topic:
Cognition and Executive Processes
Citation:
De Blasio
FM and
Barry
RJ
(2015). Total and relative prestimulus EEG band power contributions to the ERP and behavioural outcomes in an equiprobable auditory Go/NoGo task.
Conference Abstract:
XII International Conference on Cognitive Neuroscience (ICON-XII).
doi: 10.3389/conf.fnhum.2015.217.00177
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Received:
19 Feb 2015;
Published Online:
24 Apr 2015.
*
Correspondence:
Miss. Frances M De Blasio, University of Wollongong, School of Psychology, Wollongong, Australia, francesd@uow.edu.au