Benwell, C. S.Y., Keitel, C. , Harvey, M. , Gross, J. and Thut, G. (2018) Trial-by-trial co-variation of pre-stimulus EEG alpha power and visuospatial bias reflects a mixture of stochastic and deterministic effects. European Journal of Neuroscience, 48(7), pp. 2566-2584. (doi: 10.1111/ejn.13688) (PMID:28887893)
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Abstract
Human perception of perithreshold stimuli critically depends on oscillatory EEG-activity prior to stimulus-onset. However, it remains unclear exactly which aspects of perception are shaped by this pre-stimulus activity and what role stochastic (trial-by-trial) variability plays in driving these relationships. We employed a novel Jackknife approach to link single-trial variability in oscillatory activity to psychometric measures from a task that requires judgement of the relative length of two line-segments (the landmark task). The results provide evidence that pre-stimulus alpha fluctuations influence perceptual bias. Importantly, a mediation analysis showed that this relationship is partially driven by long-term (deterministic) alpha-changes over time, highlighting the need to account for sources of trial-by-trial variability when interpreting EEG predictors of perception. These results provide fundamental insight into the nature of the effects of ongoing oscillatory activity on perception. The jackknife approach we implemented may serve to identify and investigate neural signatures of perceptual relevance in more detail.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Thut, Professor Gregor and Keitel, Dr Christian and Harvey, Professor Monika and Gross, Professor Joachim and Benwell, Mr Christopher |
| Authors: | Benwell, C. S.Y., Keitel, C., Harvey, M., Gross, J., and Thut, G. |
| College/School: | College of Medical Veterinary and Life Sciences > School of Psychology & Neuroscience College of Science and Engineering > School of Psychology |
| Journal Name: | European Journal of Neuroscience |
| Publisher: | Wiley |
| ISSN: | 0953-816X |
| ISSN (Online): | 1460-9568 |
| Published Online: | 09 September 2017 |
| Copyright Holders: | Copyright © 2017 The Authors |
| First Published: | First published in European Journal of Neuroscience 48(7):2566-2584 |
| Publisher Policy: | Reproduced under a Creative Commons License |
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