The northern and Andian populations of the Plain Antvireo usually occupy the understory and mid-story levels of humid, lower and montane evergreen forest. Populations in the eastern and southern portions of their range prefer moist terra firma and várzea forest . Plain Antvireos can be found in pairs or as members of mixed species flocks foraging near the ground 4 to 5 meters up. These birds are primarily perch gleaners, but they also make short sallies to glean items from nearby foliage or hover to snag prey from the underside of leaves. Both male and female Plain Antvireos take part in incubating their eggs. It has been observed that females generally incubate the eggs during the night, and that males generally incubate the eggs during the day.