This chapter discusses the psychological process of selectively attending to one source of information to the exclusion of others. In a meta-analysis, it reviews different tasks used to study selective attention, under the construct of conflict resolution, as assessed with functional imaging techniques. Both the anterior cingulate cortex and the dorsolateral prefrontal cortex are involved in some aspect of conflict resolution, which is likely related to different mechanisms. The theme of heterogeneity of function is reflected in these results.