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
Colour sergeant as "Colour Sergeant" or "Colours" in the Royal Marines, and never by the more junior rank of "Sergeant". Unusually, NCOs with the rank of colour sergeant who hold the appointment of company quartermaster sergeant are still addressed and referred to by their rank, not their appointment. In Foot Guards regiments, colour sergeants are addressed as "Sir" and afforded the respect and privileges normally accorded to warrant officers. During ceremonial events it is from the colour sergeant that the ensign collects the colour of the battalion or regiment. In the Royal Marines Band Service, the bandmasters of the seven Royal Navy