Fig. 3.

Alpha activity per condition on source level. (A) Alpha power source reconstructions obtained using beamformer technique, shown on a standardized brain volume, per condition (contrasts same as in Fig. 2A). Power values were masked to only show grid points with significant alpha power modulation (cluster-based randomization test, p < 0.05), showing grand-average over 51 subjects. (B) Glass brain projections of peak activity per subject (N = 51), per condition. For each subject, the peak location of alpha activity was localized using the beamformer source reconstruction, and projected to Talairach space. (Note that points appearing slightly outside the brain here are due to inaccuracies introduced by normalizing the individual head model to that of standard brain in MNI space, and subsequently converting these coordinates to Talairach space, in addition to using a grid with 1-cm resolution.)