Psychology

Human cognitive neuroscience seminar

Speaker: Catriona Scrivener (University of Edinburgh)

Title: Variability of EEG electrode positions and their underlying brain regions: visualising gel artifacts from a simultaneous EEG-fMRI dataset

Abstract: The use of EEG electrode positions to guide TMS is growing in popularity, despite the fact that using MRI-guided targets for stimulation may be more precise and consequently associated with stronger TMS effects (Beynel et al., 2019; Sack et al., 2009). Although some variation is implicitly expected, our aim was to explicitly quantify the variation in electrode positions and their underlying brain regions using 10-10 fixed cap EEG setup. We identified the cortical areas underlying each electrode by projecting from gel artifacts that appear on skull reconstructions from an EEG-fMRI dataset, finding the largest variability in MNI coordinates was associated with parietal/occipital electrodes. Furthermore, brain regions covered by electrode pairs were not always consistent. e.g., C1 was mapped to BA4 (primary motor cortex), whereas C2 was closer to BA6 (premotor cortex). Using the Harvard-Oxford Cortical Atlas also highlighted that some electrodes may fall across a range of different regions between participants, even across lobes. e.g., FT7: precentral gyrus, temporal pole, anterior STG, IFG. Therefore, if you decide to stimulate based on standard EEG locations you are likely to be outside of your ROI in some participants, and this variation may be region dependent.

Contact

The seminars are organised by the Human Cognitive Neuroscience research group. For further information, or if you would like to join the e-mail list for these seminars, please email Ed Silson.

Ed Silson

Human cognitive neuroscience

Feb 09 2022 -

Human cognitive neuroscience seminar

2022-02-09: Variability of EEG electrode positions and their underlying brain regions: visualising gel artifacts from a simultaneous EEG-fMRI dataset

Online via link invitation