Research Paper Volume 15, Issue 24 pp 14574—14590

Figure 3. Grand-averaged beamformer images (pseudo-t) across all participants for theta (left) and alpha/beta (right) bands. During the encoding phase (top), there were increases in theta band amplitude relative to baseline in the primary visual cortex and decreases in alpha band activity (i.e., more negative relative to baseline) in the lateral occipital cortices, parietal cortices, and left hemisphere frontal cortex (including language areas). During the maintenance phase (middle), theta increases were limited to the right dlPFC and decreased alpha/beta activity in the left hemisphere frontal cortex (relative to baseline) was largely sustained. Additionally, a decrease in alpha/band activity relative to the baseline was observed in the lateral occipital cortices during the maintenance phase. During the retrieval phase (bottom), theta band activity increased in the right posterior cingulate gyrus and bilateral primary visual cortices, while alpha activity decreased (i.e., became more negative) in the lateral occipital cortices, left SMG, and left angular gyrus. Finally, decreased beta activity (i.e., more negative relative to baseline) in the bilateral primary motor cortices, lateral occipital cortices, and right superior parietal lobe was observed.