Cortical Activation Effects on Cognitive Processes
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1
University of Wollongong, School of Psychology, Australia
Electroencephalographic (EEG) activity affects stimulus-response processes marked by event-related potentials (ERPs) and reaction times (RTs), but a comprehensive understanding of these relationships within a cued Continuous Performance Test (CPT) has yet to be achieved. This study examined EEG activation from within the task (measured as the EEG difference in the pre-cue [PC] and pre-imperative [PI] periods) and from a task-related perspective (examined as the change in EEG from a resting eyes-open [EO] state to the PC period within the task) to determine performance effects in 60 participants completing a cued CPT. A series of numbers were presented where participants pressed a button to the designated Go, 9, but only when cued by 1, and refrained from responding to any cued NoGos. EEG activity in the delta to beta bandwidths was extracted via FFTs from the EO, PC, and PI periods. Imperative Go/NoGo ERPs were submitted to Principal Components Analyses, with the following components identified: CNV, N2, P3, and Slow Wave (SW). Mean Go RTs were also measured. Scalp regions of maximal changing EEG amplitude were identified and used as predictors to determine the effects of within-task and task-related activation on ERPs and RTs. Increases in within-task delta activation were directly linked to CNV peak amplitudes, and also contributed to faster RTs, and the NoGo SW negativity. Within-task reductions of alpha predicted NoGo P3 amplitude. A broadband reduction in activity levels was apparent in task-related activation that produced similar ERP relations. Delta and alpha levels were predictive of Go P3 positivity, but larger reductions in delta and theta led to greater NoGo P3 amplitude and SW negativity. The distinct characteristics of within-task and task-related cortical activation thus play a modulatory role in cognitive processes related to response execution and inhibition that affect overall task performance.
Keywords:
cortical activation,
Event-related potentials,
Cueing,
cognitive control,
performance
Conference:
ASP2015 - 25th Annual Conference of the Australasian Society for Psychophysiology, Sydney, Australia, 2 Dec - 4 Dec, 2015.
Presentation Type:
Oral Presentation
Topic:
Psychophysiology
Citation:
Karamacoska
D and
Barry
RJ
(2015). Cortical Activation Effects on Cognitive Processes.
Conference Abstract:
ASP2015 - 25th Annual Conference of the Australasian Society for Psychophysiology.
doi: 10.3389/conf.fnhum.2015.219.00027
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Received:
20 Oct 2015;
Published Online:
30 Nov 2015.
*
Correspondence:
Miss. Diana Karamacoska, University of Wollongong, School of Psychology, Wollongong, NSW, 2500, Australia, d.karamacoska@westernsydney.edu.au