V1
visual area 1, which in primates is coextensive with the striate cortex (primary visual cortex). Neurons in V1 have relatively simple stimulus requirements for maximum activation, unlike the visual areas to which V1 projects, which include V2, V4, and V5. V1 is the preferred name of this cortex for discussions of the functional differences between cortical regions; striate cortex, primary visual cortex, and area 17 are the preferred names for discussions of cortical anatomy.