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In page Visual cortex:

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The firing properties of V4 were first described by Semir Zeki in the late 1970s, who also named the area. Before that, V4 was known by its anatomical description, the prelunate gyrus. Originally, Zeki argued that the purpose of V4 was to process color information. Work in the early 1980s proved that V4 was as directly involved in form recognition as earlier cortical areas.[citation needed] This research supported the two-streams hypothesis, first presented by Ungerleider and Mishkin in 1982.