The term area V4 refers to an occipital lobe structure defined by multiple criteria in the human and the macaque.It surrounds most of area V3. A part of early visual cortex, it is distinguished from surrounding areas by myelination, thickness, resting functional connectivity and visuotopic connectivity. Other authors have referred to the same topological area as V4d, V4v, hV4, hOC4v, hOC4lp, or LO1 ( Glasser-2016 ).