Prestimulus alpha and beta brain state effects in the equiprobable Go/NoGo task: Healthy ageing
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1
University of Wollongong, School of Psychology, Australia
Aims: It is well known that task-related processing, indexed by event-related potentials (ERPs), is affected by ongoing electroencephalographic (EEG) brain states. However, while EEG and ERP measures each show significant age-related change, little is known about the consistency in their relationship across the lifespan. Here we compare EEG-ERP relationships in the alpha and beta bands between young and older adults to assess EEG-ERP contribution stability in healthy ageing. Method: Continuous EEG was recorded from 20 young (aged 18-25 years) and 20 gender-matched older (aged 59-74) adults while they completed an auditory equiprobable Go/NoGo paradigm. Data were processed separately for the alpha and beta bands. Discrete Fourier transforms quantified prestimulus band amplitudes, and the topographic region of interest was determined. Mean band amplitude in the region of interest was then used to selectively sort accepted Go and NoGo epochs, yielding 10 sets of Go/NoGo ERPs for each band. Go reaction time (RT) data were also derived for these prestimulus EEG levels. Temporal principal components analyses quantified ERP component amplitudes, and only components common to both groups were assessed. Results: Seven components were analysed: P1, N1-1, Processing Negativity (PN), P2/N2b, P3, Slow Wave (SW), and Late Positivity (LP). EEG-ERP relationships showed general consistency between the young and older adult groups. Age-related change was also seen for prestimulus alpha and N1-1, P3, SW, and LP, and between prestimulus beta and N1-1, PN, SW, and LP; most involved topographic interaction. Prestimulus alpha also modulated RT across the groups. Conclusions: The complex pattern of results supports the general maintenance of fundamental EEG-ERP relationships across the lifespan, and highlights the capacity for subtle and dynamic shifts in healthy ageing. Such adaptive shifts in brain dynamics may reflect a compensatory mechanism in healthy ageing, supporting task performance in light of age-related structural and functional brain changes.
Keywords:
EEG/ERP dynamics,
Equiprobable auditory Go/NoGo,
Principal Components Analysis (PCA),
alpha,
beta,
Healthy Ageing
Conference:
ASP2016 - The 26th Annual Meeting of the Australasian Society for Psychophysiology, Adelaide Australia, Adelaide,SA, Australia, 12 Dec - 14 Dec, 2016.
Presentation Type:
Oral Presentation
Topic:
Abstract (general)
Citation:
De Blasio
FM and
Barry
RJ
(2016). Prestimulus alpha and beta brain state effects in the equiprobable Go/NoGo task: Healthy ageing.
Conference Abstract:
ASP2016 - The 26th Annual Meeting of the Australasian Society for Psychophysiology, Adelaide Australia.
doi: 10.3389/conf.fnhum.2016.221.00005
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Received:
21 Nov 2016;
Published Online:
05 Dec 2016.
*
Correspondence:
Miss. Frances M De Blasio, University of Wollongong, School of Psychology, Wollongong, NSW, 2522, Australia, francesd@uow.edu.au