Fig. 3.

Effect of attention at the source level. A) and B) illustrate the average difference in gamma power (30–70 Hz; 0.3–1 s), calculated as a percentage change between attended and ignored gratings, separately for gratings presented in the left (A) and in the right hemi-field (B). Correspondingly, C) and D) illustrate the difference after correction for multiple comparisons, where significant paired-sample t-statistics (p < 0.05) were masked according to the results of a non-parametric cluster-based permutation test (p < 0.05, corrected). Results were projected onto the surface of an MNI template brain (left medial, bilateral inferior and right medial views). P, Posterior; L, Left; R, Right.