Optimising detection of ERP Go/NoGo condition effects with separate PCAs
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1
University of Wollongong, School of Psychology, Australia
Aims: To better understand the cognitive processes involved in an equiprobable Go/NoGo task, we have been using temporal Principle Components Analysis (PCA) to identify the ERP components involved. Go and NoGo ERPs are commonly analysed together in one PCA, resulting in a series of components differing between the conditions in amplitude and/or topography, but not latency. While providing a good approximation to the early ERP components (e.g., N1), it is not optimal for the later components (e.g., P3), which may differ substantially in latency between Go and NoGo. This study aimed to optimise the separation of Go and NoGo effects in the ERP components.
Method: Undergraduate students (N = 28) received 600 50 ms tone stimuli at 60 dB SPL across four blocks. Half were at 1000 Hz, half at 1500 Hz, and SOA was 1100 ms. The target tone required a button-press response, and was balanced between blocks and subjects. After EOG correction, ERPs were obtained for correct Go and NoGo responses. The usual Combined PCA was carried out with all Go and NoGo ERP inputs, and compared with results of Separate PCAs based on either the Go or NoGo ERPs.
Results: Components obtained from the Combined and Separate PCAs were broadly similar, providing support for our previous findings and the sequential processing schema proposed for this paradigm. As expected, the Separate PCAs generated latency differences for components in each processing chain. These components were a good match for the late Go/NoGo ERP peaks. Also, better-defined and larger early components were obtained, fitting the stages in our hypothetical processing schema.
Conclusion: Overall, the Separate PCAs yielded a better partitioning of the ERP variance associated with the Go and NoGo conditions than those from the Combined PCA. Use of this approach should be considered in future investigations of condition effects.
Keywords:
Condition effects,
Equiprobable auditory Go/NoGo paradigm,
ERPs,
PCA,
Separate vs. Combined PCAs,
Sequential processing schema
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:
Barry
RJ,
De Blasio
FM,
Fogarty
JS and
Karamacoska
D
(2015). Optimising detection of ERP Go/NoGo condition effects with separate PCAs.
Conference Abstract:
ASP2015 - 25th Annual Conference of the Australasian Society for Psychophysiology.
doi: 10.3389/conf.fnhum.2015.219.00040
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Received:
18 Oct 2015;
Published Online:
30 Nov 2015.
*
Correspondence:
Prof. Robert J Barry, University of Wollongong, School of Psychology, Wollongong, NSW, 2522, Australia, rbarry@uow.edu.au