Colour centre in humans as an area specialized for colour vision. V2, also called the prestriate cortex, is believed to have a small role in colour processing by projecting signals from V1 to the V4-complex. Whether or not colour selective cells are present in V2 is still being investigated. Some optical imaging studies have found small clusters of red-green colour selective cells in V1 and V2, but not any blue-yellow colour selective cells. Other studies have shown that V2 is activated by colour stimuli, but not colour after images.[8] V4 also has feedback on V2, suggesting that there is a defined network
Flowers Are Red in a corner. Finally, the now terrified little boy gives in and tells the teacher that "flowers are red, and green leaves are green." When he goes to a different school, a new teacher encourages her students to use all sorts of colors, only to find the student only coloring his flowers red and green; when the new teacher asks the boy why, he meekly responds by quoting his previous teacher—"flowers are red, and green leaves are green." In the live concert versions, Chapin extended the song's ending to: "There still must be a way to have our children say..."