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
Edible flower unopened buds of most species, can be distasteful, often bitter. The taste and color of nectar widely varies between different species of flower; consequently, honey may vary in color and taste depending of the species of flower. Many flowers can be eaten whole, but some have bitter parts, such as the stamens and stems. Some flowers are safe to eat only in small amounts. Apple flowers ("Malus" spp.) contain cyanide precursors, and Johnny jump-ups ("Viola tricolor") contain saponins. Borage ("Borago officinalis") and daylily ("Hemerocallis" spp.) flowers are diuretics, and sweet woodruff ("Galium odoratum") can have blood-thinning effects. The flowers of