(a) Layout of the experiment. Sounds were presented from one central location, while two visually and laterally presented streams of lip-moments were played. One of these streams was congruent with the auditory speech signals while the other stream was incongruent. (b) Attention was selectively oriented to either the left of right visual streams, either of which could, in turn, be congruent or incongruent with the auditory speech stimuli. (c) Attending to the congruent stimuli resulted in increases in activation in several brain areas that are typically associated with multisensory integration. These areas included the superior temporal sulcus, and superior colliculus (central panel), as well as large parts of the retinotopically organized visual areas V1 and V2. Adapted, with permission, from ref [39].