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 Colour sergeant Colour sergeant (CSgt or C/Sgt) is a rank of non-commissioned officer found in several militaries. Colour sergeant is a rank in the Foot Guards regiments of the Canadian Forces, specifically the Governor General's Foot Guards and the Canadian Grenadier Guards. It is the equivalent to warrant officer; a colour sergeant wears the rank insignia of a warrant officer (a royal crown) on all uniforms except No. 1 Ceremonial Dress, on which a special rank badge is worn: three chevrons, point down, surmounted by an image of regimental colours. Canadian colour sergeants are addressed in the same manner as