The term area ProS refers to one of the more caudal of four areas in the anterior bank of the parieto-occipital sulcus, on the medial surface of the hemisphere, that are transitional between early visual cortex and posterior cingulate association cortex. The others are area DVT, area POS1 and area POS2. ProS is bounded caudally by early visual cortex, dorsally by area DVT, rostrally by area POS1, and ventrally by area V2. It is transitional in the sense that it shares architectural features with areas more rostral and functional features similar to areas more caudal. Defined in the human by multiple criteria, it is fMRI-activated in WORKING MEMORY and RELATIONAL tasks...activated or somewhat deactivated in a FACES task depending on the neighboring area with which it is compared ( Glasser-2016 ).