Main effects of top‐down and bottom‐up processes. (a) Regions associated with the recruitment of top‐down attentional process (main effect of cognitive load, high load ‐ low load). (b) Regions associated with the recruitment of bottom‐up attentional process (main effect of stimulus surprise level, oddball ‐ standard). Red color indicates voxels with increase in activation. Blue color indicates voxels with decrease in activation. SPL, superior parietal lobule; IPS, intraparietal sulcus; AG, angular gyrus; TPJ, temporoparietal junction; lFEF, left frontal eye field; rFEF, right frontal eye field; lAI, left anterior insula; rAI, right anterior insula; vmPFC, ventral medial prefrontal cortex; PCC, posterior cingulate cortex; FG, fusiform gyrus; Tha, thalamus; MOG, middle occipital gyrus.