Figure 4

Alpha oscillations during spatial working memory performance. Significant decreases in alpha (8–11 Hz) activity were observed in the left superior parietal lobule (top left) and bilateral cuneus (top right) throughout the majority of the encoding and maintenance periods (p < 1⁻⁶, cluster-corrected). The alpha time series from the peak voxel of each region revealed strong decreases following the onset of the encoding stimulus across all three regions (see bottom panels), and these decreases persisted throughout the remainder of encoding and maintenance processes.