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 sorter likely to fluoresce. In mining sorting industry, It is also called sensor-based sorting technology. Use Optical Color (CCD Color Camera) combineX-Ray Sorting Technology and NIR (Near Infrared Spectrometry) to pick out the impurity of ore, minerals, stone and sand products, separate ore into two or more categories. In the recycling industry, colour sorters can distinguish between coloured and colourless PET and coloured and colourless HDPE flakes, as well as being able to separate flakes by colour before re-granulation. Plastic colour separators are used to separate mixed-colour plastic flakes or granules. Plastic type separators (Sensor-based sorting technology) are used to separate